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Homework Help
Math - addendum - MathMate, Wednesday, August 10, 2011 at 8:28pm
In a system of 2 linear equations in two unknowns, each equation represents a straight line.
Three situation can happen:
case 1. When the two lines intersect each other at a point with coordinates x0 and y0.
This means that the equations gi... | 4 | [
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Wordy question, about rate of temperature increase.
April 25th 2010, 12:46 PM #1
Newbie
Joined
Apr 2010
Posts
15
Wordy question, about rate of temperature increase.
A tank contains water which is heated by an electric water heater working under the the action of a thermostat. The temperature of the water... | 4 | [
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... | 33,801 | 33801 | |
[SOLVED] eigen vectors
1. July 20th 2007, 03:15 AM #1
2. July 20th 2007, 03:46 AM #2
You are incorrect about your last step. You sub the eigenvalue into the equation
$\left [ \begin{matrix} 1 & 2 \\ 5 & 4 \end{matrix} \right ] \cdot \left [ \begin{matrix} x_1 \\ x_2 \end{matrix} \right ] = \lambda... | 5 | [
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0.03369140... | 33,802 | 33802 | |
Graphs of trigonometric functions
The graphs of the three major functions are very important and you need to learn the characteristics of each.
It therefore follows that tan θ = 0, when sin θ = 0, and tan θ is undefined when cos θ = 0.
2. The range of values for tan θ is unlimited.
All of the three functions periodi... | 4 | [
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... | 33,803 | 33803 | |
Homework Help
Posted by charlie on Sunday, September 25, 2011 at 8:07am.
Hi
Would someone be able to confirm that the following equation wil give the fall time for an object falling under gravity ignoring air resistance:
T= sq root of 2h/g
where h is fall height and g is accel due to local value for gravity.
A der... | 4 | [
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how to show this map by some branch cuts maps unit circle into strip
February 9th 2009, 07:02 PM
silversand
how to show this map by some branch cuts maps unit circle into strip
$f(z)=log(\frac{1+z}{1-z})$ defined by branch cuts on the real axis from negative infinity to -1 and from 1 to infinity, f(0)=0
sho... | 4 | [
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... | 33,805 | 33805 | |
Evaluating Limits
August 4th 2009, 09:06 AM #1
Senior Member
Joined
Nov 2008
Posts
425
Evaluating Limits
Hi, I'm not sure how to evaluate the following limits.
1. lim (x^3+x^2-8x-12)/(x+2)
x->-2
so I know that I have to use the factor theorem for the numerator, and I noticed that 3 is a fac... | 5 | [
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0.02795410... | 33,806 | 33806 | |
Blind Source Separation Via ICA: Implementation 1.2 2007/12/17 16:08:43 US/Central 2007/12/19 20:39:26.071 US/Central Mark Eastaway eastaway@rice.edu John Joseph Steinbauer john.j.steinbauer@rice.edu
Angela Qian qangela@rice.edu Akshay Dayal adayal@rice.edu Mark Eastaway eastaway@rice.edu John Joseph Steinbauer john.j.... | 4 | [
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... | 33,807 | 33807 | |
logarithmic notation
October 19th 2011, 10:45 AM #1
Newbie
Joined
Oct 2011
Posts
11
Hi
Could somebody help me solve this question
(a) Express the following statements in logarithmic notation:3.375= 2.25 3/2
That's 3over2 . Thanks so much
Re: logarithmic notation
Re: logarithmic notation
... | 4 | [
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Arithmetic Progressions' Help Needed
November 6th 2010, 12:05 AM #1
Newbie
Joined
Nov 2010
Posts
3
I need help regarding the following question:
Four different integers are in A.P. One of these integers is equal to the squares of the rest integers. Find the numbers.
It is like this:
If a, b,... | 4 | [
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MATLAB ode 45 help
April 12th 2010, 12:27 PM #1
Newbie
Joined
Apr 2010
Posts
3
MATLAB ode 45 help
I have been given two second order ode's:
d^2x/dt^2 = dx/dt * sqrt( (dx/dt)^2 + (dy/dt)^2 )
d^2y/dt^2 = dy/dt * sqrt( (dx/dt)^2 + (dy/dt)^2 )
with initial conditions x(0)=0; y(0)=0; dx/dt(t=0) ... | 5 | [
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figuring out height/width from area
June 21st 2011, 03:48 AM #1
Newbie
Joined
Jun 2011
Posts
3
figuring out height/width from area
hello everyone
i have a rectangle that is 14*18
which is 252 sq. in.
i need to get the H&W of a rectangle that its area is some percent of 252 (lets say half)
... | 4 | [
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Balls in a bag
March 6th 2011, 07:03 AM #1
Newbie
Joined
Jan 2011
Posts
15
[SOLVED] Balls in a bag
Q: There are 5 black balls and 3 white balls in a bag. Three balls are chosen at random from the bag without replacement. Given that of the three balls chosen, at least one black ball and at
least one w... | 4 | [
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Lin Alg Proof
November 5th 2007, 08:31 PM #1
Newbie
Joined
Oct 2007
Posts
21
Lin Alg Proof
Given that L is an eigenvalue of an invertible matrix A, prove that 1/L is an eigenvalue for A^(-1). (NOTE: need proof for A in general; giving one example will not suffice)
L is an eigenvalue of A, so there e... | 5 | [
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High School Biology-Chemistry SMILE Meeting
27 February 2001
Notes Prepared by Porter Johnson
Ben Stark (IIT Biology) Mendel's First Law
He asked about the inheritance pattern of the offspring with respect to red and yellow corn. He described the following experiment that he had done previously:
1. Take pollen from ... | 4 | [
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Rational expressions
September 15th 2006, 03:30 PM #1
Newbie
Joined
Sep 2005
Posts
16
Rational expressions
Simplifying Rational expressions.
4x + 4/ 3x-3 X 6x - 6/5x+5
the question askes to simplify by bringing both terms to lowest common terms before multiplying. The answer is supposed to be 8... | 4 | [
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Diagonalizable Matrix
$A= \left(\begin{array}{cccccc}1&2&2^2&...&...&2^{n-1}\\2&2^2&2^3&...&...&2^{n}\\2^2&2^3&2^4&...&...&2 ^{n+1}\\.&.&.&&&.\\.&.&.&&&.\\2^{n-1}&2^n&2^{n+1}&...&...&2^{2n-2}\end{array}\right)$
Question: Prove $\lambda=0$ is an eigenvalue of A and find a basis for it's space.
Solution: (M... | 5 | [
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Card Question
July 8th 2010, 10:20 PM #1
Newbie
Joined
Mar 2010
Posts
13
Card Question
You randomly draw 1 card from a standard deck of 52, and 1 card from another standard deck. What's the probability that the sum of the 2 cards is 7?
You can solve it by solving this question :
How many soluti... | 4 | [
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João F. Ferreira
In 2009, I posted a calculational proof of the handshaking lemma, a well-known elementary result on undirected graphs. I was very pleased about my proof because the amount of guessing involved was
very small (especially when compared with conventional proofs). However, one of the steps was too complica... | 5 | [
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Fourier Series
March 5th 2006, 08:11 PM
cherry106
Fourier Series
Can someone help me with these two Fourier Series problems please? Also, can you explain how you did the problems because I dont understand how to do Fourier Series :( ...Thanks in advance! :)
#1 Use the Fourier Series
f(x) = {0, -pi < x <... | 5 | [
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differentiation
May 20th 2008, 05:58 AM #1
Newbie
Joined
Mar 2008
Posts
13
differentiation
RMS Value of Current
i = 4sin $/pi$t is 2.828A
(hint given) $sin^2 /theta = 1/2 (1-cos 2 /theta)$
see attached for my efforts so far.
The mean square current:
$p=\frac{1}{2} \int_0^2 [i(t)]^2... | 5 | [
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-0... | 33,820 | 33820 | |
Math Help
January 10th 2007, 12:33 AM #1
Newbie
Joined
Jan 2007
Posts
8
last one
Ok, heres the last one i need help with
From a window 4.2m above the ground the angle of depression ot the foot of the building across the road is 24(degrees) and the angel of elevation of the to pof the same building ... | 4 | [
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An easy infinite series
May 22nd 2008, 07:20 PM #1
An easy infinite series
I must look pathetic, but I'm beginning with infinite series.
I invented to myself a very easy infinite series that I must determine its convergence. (I'm sure it converges even if I'm not able to prove it!).
The series is : $\sum_... | 5 | [
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Analysis of Large-Amplitude Pulses in Short Time Intervals: Application to Neuron Interactions
Mathematical Problems in Engineering
Volume 2010 (2010), Article ID 895785, 15 pages
http://dx.doi.org/10.1155/2010/895785
Research Article
Analysis of Large-Amplitude Pulses in Short Time Intervals: Application to Neuron I... | 4 | [
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0.00... | 33,823 | 33823 | |
The rectangle
August 4th 2008, 05:43 PM #1
Member
Joined
Nov 2006
Posts
152
The rectangle
The rectangle below has a base with length 26 and a height of 12. Inside the rectangle, there is an inscribed triangle whose base is the base of the rectangle, and whose third vertex lies on the
top of the recta... | 4 | [
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0.... | 33,824 | 33824 | |
Math Help
February 22nd 2009, 12:22 PM #1
Newbie
Joined
Feb 2009
Posts
1
I have a problem that i can't figure out.
a.) Consider the function f(x) = 1/(1+x^2). Write this functio as power series centered at 0.
b.) Now, use the first part find a power series for g(x) = arctan(x) also centered at ... | 5 | [
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... | 33,825 | 33825 | |
Atmósfera
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versión impresa ISSN 0187-6236
Atmósfera vol.17 no.4 México oct. 2004
Objective analysis of daily extreme temperatures over
... | 4 | [
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... | 33,826 | 33826 | |
A squarefree integers conjecture
July 20th 2010, 08:05 PM
Bacterius
[SOLVED] A squarefree integers conjecture
Hello,
I came up with a conjecture regarding squarefree integers of the form $x^2 + 1$. My conjecture is :
Quote:
$x^2 + 1$ is squarefree if and only if it is not a multiple of $25$
N... | 5 | [
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0.00408935546875,
0.0986328125,
0.03955078125,
0.047607421875,
0.03271484375,
0.0029296875,
-0.02783203125,
-0.039794921875,
0.036376953125,
0.05419921875,
0.1044921875,
-0.040771484375,
-0.048095703125,
-0.027099609375,
0.01647949... | 33,827 | 33827 | |
Homework Help
Posted by courtney thompson on Wednesday, December 31, 2008 at 3:23pm.
User: Courtney Thompson
In Course: Geometry V8 ( 2167)
Instructor: Tracie Morgan
--------------------------------------------------------------------------------
WARNING: You must not leave this exam form! If you try to click back... | 4 | [
0.006927490234375,
0.03271484375,
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0.0087890625,
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0.010009765625,
-0.049072265625,
-0.0986328125,
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-0.0... | 33,828 | 33828 | |
September
Here’s a post that’s sure to be controversial. Not only am I bringing up religion, I’m comparing Macs and PCs.
I heard someone refer to an article saying Macs are Catholic and PCs are Protestant. I haven’t seen the article in question, so I can only imagine what the analogy it had in mind. I doubt that
Cath... | 4 | [
0.06884765625,
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-0.0625,
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-0.07958984375,
0.0220947265625,
-0.068359375,
-0.044921875,
-0.0213623046875,... | 33,829 | 33829 | |
A Novel Fuzzy RPID Controller for Multiarea AGC with IABC Optimization
Journal of Engineering
Volume 2013 (2013), Article ID 510572, 13 pages
http://dx.doi.org/10.1155/2013/510572
Research Article
A Novel Fuzzy RPID Controller for Multiarea AGC with IABC Optimization
^1Technical Engineering Department, University of... | 4 | [
0.00408935546875,
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-0.04443359375,
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-0.0074768066... | 33,830 | 33830 | |
Probabilities
November 30th 2009, 07:16 PM
Johnboe
Probabilities
1. The problem statement, all variables and given/known data
The marketing department of a magazine collects the following information for a group of randomly selected subscribers. Of households that subscribe to at least one of their three ma... | 4 | [
-0.0033111572265625,
-0.004058837890625,
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-0.06591796875,
0.01177978515625,
0.064453125,
-0.002685546875,
0.08642578125,
-0.030029296875,
0.043701171875,
-0.04736328125,
0.006225... | 33,831 | 33831 | |
topolog
Product topology
In
topology
, the
cartesian product
of topological spaces is turned into a topological space in the following way. Let
I
be a (possibly infinite) index set and suppose
X[i]
is a topological space for every
i
in
I
. Set
X
= Π
X[i]
, the cartesian product of the sets
X[i]
. Fo... | 4 | [
0.00098419189453125,
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0.0235595703125,
0.000972747802... | 33,832 | 33832 | |
Integration using separation of variables
March 31st 2013, 01:55 AM #1
Member
Joined
Sep 2012
From
india
Posts
78
Integration using separation of variables
Integrate the following integral using separation of variables :
v[x] = (1/3)v -(8/9) (v[x] is the partial derivative of v w.r.t x) and v is... | 5 | [
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-0.0277099609375,
... | 33,833 | 33833 | |
Variable of two populations
July 27th 2008, 07:24 PM #1
Member
Joined
May 2008
Posts
109
Variable of two populations
Can someone help me understand how to get started on this problem?
A variable of two populations has a mean of 40 and a standard deviation of 12 for one of the populations and a mean ... | 4 | [
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0.060791015625,
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0.09375,
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0.05224609375,
0.03955078125,
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-0.04248046875,
0.0061645507812... | 33,834 | 33834 | |
Some integration problems
March 6th 2007, 09:34 PM #1
Newbie
Joined
Feb 2007
Posts
8
Some integration problems
hi
I am having a bit of trouble on the following integration problems and was wondering if anybody could help me out.
1) Integrate: ( x^2 ) / sqrt(9- x^2 ) dx
I think this one dea... | 5 | [
-0.0205078125,
-0.08642578125,
-0.01312255859375,
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0.0218505859375,
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0.03369140625,
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-0.05908203125,
0.0203857421875,
0.016357421875,
0.0299072265625,
-0.021484375,
... | 33,835 | 33835 | |
A Quasi-Variational Approach for the Dynamic Oligopolistic Market Equilibrium Problem
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 952915, 12 pages
http://dx.doi.org/10.1155/2013/952915
Research Article
A Quasi-Variational Approach for the Dynamic Oligopolistic Market Equilibrium Problem
^1Department... | 4 | [
-0.027099609375,
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-0.03125,
-0.060791015625,
0.0361328125,
-0.005859375,
-0.03442382... | 33,836 | 33836 | |
Is there a field which is the union of finitely many proper subfields?
Take the 2-minute tour ×
MathOverflow is a question and answer site for professional mathematicians. It's 100% free, no registration required.
Is there a field which is the union of finitely many proper subfields?
No. A field is a vector spa... | 5 | [
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Chance of pairs, rolling 5 dices simultaneously
November 23rd 2008, 09:22 AM
desperate87
Chance of pairs, rolling 5 dices simultaneously
Hello all,
Can you please help me solve the following problem?
This is from A first course in probability by Seldon Ross 7th edition.
Chapter 2 Problem 16
Pok... | 4 | [
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-0.0... | 33,838 | 33838 | |
sicp-ex-3.19
This is a well studied problem. Robert Floyd came up with an algorithm to solve this in the 1960s. (Yes, the same Floyd of the from the more famous Floyd-Warshall algorithm.) More infomation at:
http://en.wikipedia.org/wiki/Cycle_detection
People in the software industry seem to like to use this problem ... | 5 | [
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0.07568359375,
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0.006317138... | 33,839 | 33839 | |
Homework Help
Posted by Karoline on Saturday, November 21, 2009 at 9:58pm.
Differentiate y=(5x-2)^3(3-x)^6 using the product rule.
i don't get the step where they find the common factor could you help me by doing it step by step please ?
thank you!
• Maths - drwls, Saturday, November 21, 2009 at 10:36pm
Ther... | 4 | [
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0.0830078125,... | 33,840 | 33840 | |
Regarding Linear Algebraaa
February 23rd 2008, 05:18 PM #1
Junior Member
Joined
Feb 2008
Posts
29
Regarding Linear Algebraaa
Heres the question:
1. The point on the line x=-1+3t, y=-2+t, z=2-4t which is closest to the point (2,-2,2) is (_,_,_)? Fill in the blanks.
2. The point on the plane 3x+3y... | 5 | [
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0.103515625,
0.0238037109375,
0.060302734375,
0.06298828125,
-0.00506591796875,
0.036376953125,
-0.01214599609375,
-0.119140625,
-0.0169677734375,
0.005889892578125... | 33,841 | 33841 | |
Nullspace and basis
June 18th 2010, 03:40 AM #1
Member
Joined
Dec 2009
Posts
224
Nullspace and basis
In my textbook there is a question where they ask for a basis for the 1x3 matrix:
(10 20 10)
Answer: an orthogonal basis is {(-1,0,1)^T,(1,-1,1)^T}.
So, I know that the equation correspondi... | 5 | [
-0.130859375,
-0.002593994140625,
-0.0556640625,
0.0037384033203125,
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0.03466796875,
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-0.0023040771484375,
-0.0751953125,
0.... | 33,842 | 33842 | |
Impact of Urban Surface Roughness Length Parameterization Scheme on Urban Atmospheric Environment Simulation
Journal of Applied Mathematics
Volume 2014 (2014), Article ID 267683, 14 pages
http://dx.doi.org/10.1155/2014/267683
Research Article
Impact of Urban Surface Roughness Length Parameterization Scheme on Urban A... | 4 | [
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0.05078125,
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0.03759765625,
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... | 33,843 | 33843 | |
Trig identities
Is this what you mean? Prove that, $1 - \frac{sin^2 x}{1 + cos x} = cos x$ If so, then it is not as hard as you think. Everything is already changed to $sine$ and $cosine$, so half of the work is
done. First, multiply both sides by $1 + cos x$: $1 + cos x - sin^2 x = cos x + cos^2 x$ Then subtract cos x... | 4 | [
-0.10888671875,
0.115234375,
0.0458984375,
0.07421875,
-0.03173828125,
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-0.006378173828125,
-0.011474609375,
-0.029296875,
-0.005584716796875,
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0.01470947265625,
-0.0517578125,
-0.05419921875,
0.091796875,
0.01171875... | 33,844 | 33844 | |
To obtain an estimate for the variance of the population mean
April 19th 2010, 07:25 AM #1
Newbie
Joined
Dec 2008
Posts
6
To obtain an estimate for the variance of the population mean
To obtain an estimate for the variance of the population mean,
sigma^2, a natural idea would be to calculate
1/n... | 5 | [
0.06689453125,
-0.033935546875,
0.05029296875,
0.056884765625,
-0.01123046875,
0.08642578125,
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0.06640625,
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-0.0123291015625,
0.11376953125,
-0.0311279296875,
... | 33,845 | 33845 | |
GCD = p (prime)
February 17th 2007, 03:53 PM #1
Member
Joined
Sep 2006
Posts
221
GCD = p (prime)
Suppose (a, b) = p, which is a prime, then determine EVERY possible value of:
1.) (a^2, b^2)
2.) (a^2, b)
3.) (a^3, b^2)
Note: (a, b) means gcd(a, b).
Hello, Ideasman!
I don't kn... | 4 | [
0.0174560546875,
0.0013580322265625,
-0.08349609375,
-0.0230712890625,
-0.001983642578125,
0.0498046875,
0.07666015625,
0.0211181640625,
0.0224609375,
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0.039306640625,
0.06494140625,
0.0142822265625,
-0.02490234375,
0.08056640625,
0.0478515625,
-0.02294921875,
-0.034423... | 33,846 | 33846 | |
Finding all r ∈ R such that r<1+1/r?
December 18th 2011, 03:42 PM #1
Newbie
Joined
Dec 2011
Posts
1
Finding all r ∈ R such that r<1+1/r?
Find all r ∈ R such that r<1+1/r?
So I'm having difficulty with this problem.
I've figured out that r is a variable and r does not = 0 and by solving it, multip... | 4 | [
-0.019287109375,
0.0361328125,
-0.0205078125,
0.0303955078125,
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0.040283203125,
0.14453125,
0.0201416015625,
-0.0174560546875,
-0.005767822265... | 33,847 | 33847 | |
the encyclopedic entry of Fold bifurcation
Bifurcation theory
is the
mathematical
study of changes in the qualitative or
topological
structure of a given family. Examples of such families are the
integral curves
of a family of
vector fields
or, the solutions of a family of
differential equations
. Most commo... | 4 | [
0.0186767578125,
-0.06640625,
0.0224609375,
-0.037841796875,
-0.0986328125,
-0.047607421875,
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0.0693359375,
0.09375,
-0.051513671875,
0.044921875,
0.042236328125,
-0.04345703125,
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-0.0027923583984375,
0.07568359375,
-0.126953125,
-0.0034637451171875,
... | 33,848 | 33848 | |
Memoizing polymorphic functions via unmemoization
Last year I wrote two posts on memoizing polymorphic functions. The first post gave a solution of sorts that uses a combination of patricia trees (for integer-keyed maps), stable names, and type
equality proofs. The second post showed how to transform some functions tha... | 4 | [
-0.076171875,
0.0517578125,
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0.0093994140625,
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-0.020263671875,
-0.044189453125,
-0.0458984375,
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0.046875,
-0.0126953125,
0.054931640625,
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0.142578125,
... | 33,849 | 33849 | |
Math Help
February 20th 2008, 01:47 PM #1
Member
Joined
Nov 2007
Posts
232
Vectors
A plane flies on a bearing of 120 degrees at a constant speed of 550 km/h. If the velocity of the wind is 50 km/h on a bearing 220 degrees, what is the velocity of the plane with respect to the
ground?
Textbook A... | 4 | [
0.038330078125,
0.045166015625,
-0.033447265625,
-0.018310546875,
0.037841796875,
0.0240478515625,
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-0.0023956298828125,
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0.0201416015625,
0.037353515625,
0.031005859375,
-0.0017852783203125,
-0.014892578125,
-0.044677734375,
0.09228515625,
-0.10009765... | 33,850 | 33850 | |
Homework Help
Posted by Jon on Monday, December 3, 2007 at 10:41pm.
A section of highway connecting two hillsides with grades of 6% and 4% is to be build between two points that are separated by a horizontal distance of 2000 feet. At the point where the two hillsides
come together, there is a 50-foot difference in ele... | 5 | [
-0.06689453125,
0.06494140625,
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0.0908203125,
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0.130859375,
-0.0439453125,
-0.03540039062... | 33,851 | 33851 | |
The Pruning Theorem: Thinning Based on a Loose Notion of Monotonicity
The reason I studied the thinning theorem again is because I need a slightly generalised variation. The following seems to be what I need. The general idea and the term “pruning” emerged from
discussion with Sharon Curtis. The term “lax preorder” is... | 4 | [
-0.0225830078125,
-0.01019287109375,
0.056640625,
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0.036376953125,
0.038330078125,
0.029296875,
-0.044677734375,
0.0927734375,
... | 33,852 | 33852 | |
Integration with trig functions
August 11th 2010, 12:07 PM #1
Member
Joined
Feb 2010
From
United States
Posts
155
Thanks
1
Integration with trig functions
Evaluate the integral sinx/cos^2x dx from 0 to pi/3.
So I've gotten it to tanxcosx, but I don't know the indefinite integral of these, a... | 5 | [
-0.0908203125,
0.005767822265625,
0.0279541015625,
0.0169677734375,
-0.021484375,
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0.01214599609375,
0.03125,
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-0.05908203125,
0.0361328125,
-0.006866455078125,
0.005523681640625,
-0.07275390625,
0.051025390625,
-0.05371093... | 33,853 | 33853 | |
An Idelic Life
In this post, I will explain some different tuning systems and their advantages and disadvantages. First, let’s see what the basic goals are of tuning systems.
1. There should be 12 notes per octave, in half-step intervals.
2. An octave (12 half steps) should be at a ratio of 2:1.
3. A fifth (7 half ... | 4 | [
-0.05712890625,
0.05908203125,
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-0.072265625,
0.0162353515625,
-0.0164794921875,
-0.02734375,
0.031982... | 33,854 | 33854 | |
123 written in a random order probability any are in the right place
November 15th 2009, 05:49 PM #1
Junior Member
Joined
Oct 2009
From
Aberystwyth, Wales
Posts
36
123 written in a random order probability any are in the right place
i have the question if 1,2 & 3 are written in a random order whats t... | 4 | [
-0.007171630859375,
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0.04345703125,
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-0.02001953125,
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-0.0159912109375,
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0.07421875,
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0.06494140625,
-0.0703125,
-0.054931640625,
-0.03271484375,
-0.06787109375,
-0.0105590820312... | 33,855 | 33855 | |
Need a method for solving this..
February 10th 2011, 09:14 PM #1
Junior Member
Joined
Nov 2009
Posts
35
$\lim_{x \to 0} \frac{ln(1-x) + sin(x)}{1-cos^2(x)}$
Tried using L'Hopital and I know that's what you have to use but I still get stuck here..
$\lim_{x \to 0} \frac{\frac{1}{x-1}+cos(x)}{sin^2... | 5 | [
0.0167236328125,
0.0159912109375,
0.0040283203125,
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0.002777099609375,
-0.03125,
-0.0069580078125,
-0.01123046875,
-0.064... | 33,856 | 33856 | |
I'm struggling with this question...Need Help!!!
July 15th 2008, 07:36 PM #1
Newbie
Joined
May 2008
Posts
3
A parcel of land is in the shape of an isosceles triangle. The base has length 425 feet; the other sides, which are of equal length, meet at an angle of 39 degree. How long are the two equal
sid... | 4 | [
-0.010498046875,
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-0.0311279296875,
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0.01031494140625,
0.031494140625,
0.04833984375,
-0.0874023437... | 33,857 | 33857 | |
Homework Help
Posted by jenny on Wednesday, March 13, 2013 at 12:29pm.
5x+4y-5z=44
3x-4y+3z=-10
6x-3y+6z=-15
help solve it
• math - Dr. Jane, Wednesday, March 13, 2013 at 2:03pm
Your goal is to go from 3 equations in 3 variables down to 2 equations in 2 variables.
It is up to you to decide which variab... | 4 | [
-0.0341796875,
0.0732421875,
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0.0177001953125,
0.00007295608520507812,
0.048583984375,
-0.044189453125,
0.034... | 33,858 | 33858 | |
Length Contraction in the Muon Experiment
1.
Registered Senior Member
Posts
2,250
superluminal
Ok I found your error. Give me a while...
On a scale of 1-10, how bad was it? Other than the acceleration issue - I still don't see any possible counter argument. Anyway, I await y... | 5 | [
-0.025146484375,
-0.038330078125,
0.12109375,
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0.109375,
0.003021240234375,
-0.035400390625,
0.0703125,
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0.052734375,
-0.0966796875,
0.01068115234375,
0.0016632080078125,
0.0166015625... | 33,859 | 33859 | |
Finding mean and variance from the mean?
November 17th 2008, 11:19 PM #1
Newbie
Joined
Sep 2008
Posts
14
Finding mean and variance from the mean?
Find the mean and variance of the mean of a random sample of 9 from a distribution having pdf 6x(1-x) 0 < x < 1, zero elsewhere.
I don't even know how to ... | 5 | [
-0.02001953125,
-0.0272216796875,
0.05517578125,
-0.0791015625,
-0.02978515625,
0.019775390625,
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0.09130859375,
0.04541015625,
-0.03173828125,
-0.0751953125,
0.007659912109375,
0.028076171875,
-0.1025390625,
-0.0390625,
0.005645751953125,
-0.039794921875,
-0.0041... | 33,860 | 33860 | |
Direction of Line (I think)
February 9th 2011, 02:38 AM
kerrymaid
Direction of Line (I think)
Hi,
I'm not sure if this falls under the category of coordinate geometry or trigonometry. I need to determine the direction an object is moving in order to figure out its future position, Pf. This
works for me ... | 4 | [
0.01263427734375,
-0.010498046875,
-0.050048828125,
-0.06640625,
-0.000476837158203125,
0.0172119140625,
-0.0712890625,
0.06298828125,
0.017822265625,
0.01708984375,
0.06103515625,
-0.0185546875,
-0.091796875,
-0.00086212158203125,
-0.0174560546875,
0.009521484375,
-0.0286865234375,
... | 33,861 | 33861 | |
Common Fixed Point Theorems of Altman Integral Type Mappings in
Abstract and Applied Analysis
Volume 2012 (2012), Article ID 630457, 13 pages
http://dx.doi.org/10.1155/2012/630457
Research Article
Common Fixed Point Theorems of Altman Integral Type Mappings in -Metric Spaces
Institute of Applied Mathematics and Dep... | 5 | [
0.0185546875,
-0.01129150390625,
0.048583984375,
-0.138671875,
-0.04296875,
0.041259765625,
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0.0294189453125,
0.00982666015625,
-0.050537109375,
0.0439453125,
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0.028076171875,
-0.03857421875,
0.01092529296875,
-0.013916015625,
-0.00762939453125,
0.01025... | 33,862 | 33862 | |
if ((2^n) -1 ) is prime, prove n is prime ?! >.<
March 18th 2009, 01:33 AM
CoCo_RoAcH
if ((2^n) -1 ) is prime, prove n is prime ?! >.<
Ok heres the question! :
if (2^n) -1 ) is prime, prove n is prime
i have attempted this question. However, i do not knw if i have started it off right, below is what i ... | 4 | [
-0.0201416015625,
0.0380859375,
-0.029296875,
0.06689453125,
0.09033203125,
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0.08935546875,
-0.09814453125,
-0.042724609375,
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0.015380859375,
-0.0308837890625,
-0.0264892578125,
0.033935546875,
-0.0549316... | 33,863 | 33863 | |
What is x^x^x^x...
Hi ! it is an "infinite power tower" But your symbolism is ambiguous : it could means several different power towers. One have to use brakets to give a precise definition (in attachment) If the tower
is finite (with a finit number of x), the related function of x can be formally expressed as the firs... | 5 | [
0.0400390625,
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0.056640625,
0.040771484375,
0.0927734375,
-0.1015625,
0.0354003906... | 33,864 | 33864 | |
why didn't i solve the lim well?
April 25th 2013, 10:15 PM
orir
why didn't i solve the lim well?
$\lim_{x\rightarrow-\infty}(\sqrt{x^{2}+x}-x) = ?$. this is how i solve this, but i know it's not true.. why? $<br /> (\sqrt{x^{2}+x}-x)=\frac{(\sqrt{x^{2}+x}-x)\cdot(\sqrt{x^{2}+x}+x)}{(\sqrt{x^
{2}+x}+x)}=$$\fr... | 5 | [
-0.03564453125,
-0.048095703125,
0.1064453125,
0.0478515625,
0.033447265625,
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0.01470947265625,
0.052734375,
-0.034912109375,
0.087890625,
0.015625,
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0.052490234375,
-0.01318359375,
0.0028076171875,
0.048095703125,
-0.064453125,
0.01... | 33,865 | 33865 | |
Can Q be ordered in such way that it will be isomorphic to (N,<)
July 28th 2011, 04:06 AM #1
Junior Member
Joined
Apr 2011
From
Somwhere in cyberspace.
Posts
68
Thanks
2
Can Q be ordered in such way that it will be isomorphic to (N,<)
The question is in the title. No matter how strange and useles... | 5 | [
-0.08349609375,
0.0390625,
0.01220703125,
-0.0150146484375,
-0.10107421875,
0.052734375,
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0.00909423828125,
0.04931640625,
-0.07275390625,
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0.037353515625,
0.06884765625,
0.07373046875,
-0.046142578125,
-0.03759765625,
0.050048828125,
-0.07080078125,... | 33,866 | 33866 | |
Is this possible?
December 18th 2009, 08:12 AM #1
Member
Joined
Sep 2009
Posts
242
Thanks
1
Is this possible?
Is it possible to have a function $f$ such that:
$\frac{f}{2}=\int_{a}^{b}f'$ ?
Examples would be welcome. But I am mostly interested in whether it is possible or not.
Thanks
... | 5 | [
-0.007720947265625,
-0.07470703125,
0.0186767578125,
-0.04345703125,
-0.0595703125,
-0.03369140625,
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0.003173828125,
0.02978515625,
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0.04150390625,
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0.0458984375,
0.057861328125,
0.032470703125,
-0.031494140625,
0.061767578125,... | 33,867 | 33867 | |
Linear Algebra question
June 14th 2005, 05:14 AM #1
Newbie
Joined
Apr 2005
Posts
12
Linear Algebra question
Hi I have this urgent linear algebra question.
I'm given this here formula $A x = b$
where A = $\left[ \begin{array}{ccc} 1 & 0 & 2 \\ 2 & 1 & 3 \end{array} \right]$ and $\left[ \begin{ar... | 4 | [
-0.046875,
-0.0291748046875,
-0.07763671875,
-0.0791015625,
0.0108642578125,
0.0439453125,
0.042724609375,
-0.06640625,
-0.0245361328125,
0.026123046875,
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-0.06005859375,
-0.00604248046875,
-0.02197265625,
-0.0198974609375,
0.0849609375,
-0.033935546875,
-0.04345... | 33,868 | 33868 | |
Comparison of Analytical Solution of DGLAP Equations for
Advances in High Energy Physics
Volume 2013 (2013), Article ID 829803, 10 pages
http://dx.doi.org/10.1155/2013/829803
Research Article
Comparison of Analytical Solution of DGLAP Equations for at Small by Two Methods
^1Department of Physics, Gauhati University... | 4 | [
-0.1689453125,
0.03564453125,
0.034423828125,
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0.0028533935546875,
0.05712890625,
0.005828857421875,
0.003997802734375,
0.0451... | 33,869 | 33869 | |
Lessons In Electric Circuits -- Volume IV
Lessons In Electric Circuits -- Volume IV
Chapter 7
BOOLEAN ALGEBRA
0 + 0 = 0
0 + 1 = 1
1 + 0 = 1
1 + 1 = 1
Rules of addition for Boolean quantities
"Gee Toto, I don't think we're in Kansas anymore!"
Dorothy, in The Wizard of Oz
Math... | 5 | [
-0.00677490234375,
0.0146484375,
0.0263671875,
0.01336669921875,
-0.027587890625,
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0.004150390625,
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-0.045654296875,
-0.07177734375,
-0.08984375,
0.0654296875,
-0... | 33,870 | 33870 | |
Bulletin of the World Health Organization
Services on Demand
Article
Indicators
Related links
Share
Print version ISSN 0042-9686
Bull World Health Organ vol.79 n.7 Genebra Jul. 2001
http://dx.doi.org/10.1590/S0042-96862001000700004
Modelling HIV/AIDS epidemics in sub-Saharan Africa using seroprevalence data fr... | 4 | [
-0.01953125,
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-0.0032196044921875,
-0.05224609375,
-0.0... | 33,871 | 33871 | |
complex number help
December 10th 2008, 05:05 AM #1
MHF Contributor
Joined
Sep 2008
From
West Malaysia
Posts
1,261
complex number help
The complex number $z=\frac{1+i}{3-2i}$.Write down the argument for $z^2$ and find the exact value of |z^2| .
My working :
$z=\frac{1}{13}+\frac{5}{13}i$
... | 4 | [
-0.05029296875,
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0.06982421875,
-0.037109375,
-0.052734375,
0.01483154296875,
-0.0664062... | 33,872 | 33872 | |
[SOLVED] Substitution help...
February 6th 2010, 06:48 PM #1
Member
Joined
Sep 2009
Posts
82
[SOLVED] Substitution help...
Hi, I just need help with taking the derivative of the substition factor. From there I can (hopefully) get the rest.
DE:
$x^3 \dfrac{dy}{dx} + x^2y+x=3e^{xy}$
Change of... | 5 | [
-0.0380859375,
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-0.007110595703125,
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0.032958984375,
0.01422119140625,
0.1123046875,
0.06787109375,
-0.0810546... | 33,873 | 33873 | |
Deriving Simpson's Rule
December 13th 2010, 09:23 PM #1
Deriving Simpson's Rule
To derive Simpson's Rule and it's error, we can integrate a 2nd degree Lagrange polynomial. To make the process less laborious, we can integrate over the interval [-h,h] using the points (-h,f
(-h)), (0,f(0)), (h,f(h)). We end up ... | 5 | [
-0.00604248046875,
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0.06787109375,
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0.0673828125,
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-0.01190185546875,
-0.0009765625,
-0.0147705078125,
-0.0151... | 33,874 | 33874 | |
RC
Feb 12, 2013, • #3
01:22 PM
Thrust Power Derivation
Edina, MN, USA Fundamentally, thrust is proportional to rpm squ... | 4 | [
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0.014404296875,
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0.021728515625,
-0.040283203125,
-0.002655029296875,
-0.0048828125,
0.09228515625,
... | 33,875 | 33875 | |
Sampling Size of Population Proportion
The quality of a sample survey can be improved by increasing the sample size. The formula below provide the sample size needed under the requirement of population proportion interval estimate at (1 −
α) confidence level, margin of error E, and planned proportion estimate p. Here,... | 5 | [
0.020751953125,
0.0859375,
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0.0263671875,
-0.006500244140625,
0.043701171875,
0.00872802734375,
... | 33,876 | 33876 | |
Controller Synthesis of Time Petri Nets Using Stopwatch
Journal of Engineering
Volume 2013 (2013), Article ID 970487, 13 pages
http://dx.doi.org/10.1155/2013/970487
Research Article
Controller Synthesis of Time Petri Nets Using Stopwatch
Laboratoire VeriForm, Department of Computer Engineering, Ecole Polytechnique d... | 4 | [
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-0.047607421875,
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-0.052490234375,
0.0554199218... | 33,877 | 33877 | |
I need some help with a tangent line problem
February 22nd 2011, 05:23 PM #1
Newbie
Joined
Feb 2011
Posts
7
I need some help with a tangent line problem
Hi.
I need some HW help again.
Let f(x) = 12x + 15 - 13e^x . Then the equation of the tangent line to the graph of f(x) at the point (0, 2) is... | 4 | [
-0.037841796875,
0.0390625,
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0.138671875,
-0.031494140625,
0.049560546875,
0.1630859375,
-0.10888671875,
0.005889892578125,
-0.02685546875,
0.00092315673828125,
0.10009765625,
-0.062255859375,
-0.006347656... | 33,878 | 33878 | |
Math Help
September 6th 2008, 12:42 PM #1
Member
Joined
Sep 2007
Posts
75
Dice
If you roll five six-sided dice, then put aside any one set of same numbered dice/die that show the/a most occurring number and re-roll any remaining dice/die, what is the chance that within
those two rolls (or one roll i... | 4 | [
0.007171630859375,
-0.051513671875,
0.0024871826171875,
-0.0673828125,
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-0.0216064453125,
0.018310546875,
-0.0269775390625,
0.03955078125,
0.000457763671875,
-0.028564453125,
0.037109375,
0.04638671875,
-0.021728515625,
-0.042236328125,
-0.0126953125,
-0.06982421875,
... | 33,879 | 33879 | |
Homework Help
Posted by Help on Tuesday, October 23, 2007 at 10:25pm.
g(x)=[(4x-7)(x+11)]
Find g'(x)
I thought that you use the product rule but I have the answer and I am not getting the same thing.
The answer is
g'(x)=3/2[4x^2+37x-77]^1/2 * (8x+37)
I keep getting just 8x+37 when I do the product rule. What am I... | 4 | [
0.0035400390625,
-0.01483154296875,
0.03271484375,
-0.0498046875,
-0.0284423828125,
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0.0185546875,
-0.031494140625,
0.055419921875,
0.0277099609375,
-0.006103515625,
0.0087890625,
-0.02099609375,
-0.00408935546875,
0.017578125,
0.01611328125,
0.0678... | 33,880 | 33880 | |
Bogglers Solutions
Rep-tiles
144- and 36-piece solutions:
1.
The proportions of the first two solutions (squares 1 and 2 above) are shown by the grids: In the first square, the sides of the two smaller rectangles are each half the size of the sides of the
large blue rectangle. In the second square, the sides of the ... | 5 | [
0.028564453125,
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0.09423828125,
-0.045166015625,
0.006683349609375,
0.00692749023... | 33,881 | 33881 | |
few simple limit problems :D
April 26th 2011, 07:01 AM #1
Junior Member
Joined
Sep 2010
Posts
47
few simple limit problems :D
hello,
I'm having problems with few limits... I have done them but my solution isn't the same as in the book... so can anyone check them or point me what do I do wrong...
... | 5 | [
-0.10498046875,
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-0.06591796875,
-0.068359375,
0.0185546875,
-0.0751953125,
... | 33,882 | 33882 | |
last question i promise- another antiderivative
April 11th 2008, 06:49 PM #1
Newbie
last question i promise- another antiderivative
Hello, rsanford!
$f'(x) \:= \:\sqrt{x}\,(9 + 5x),\quad f(1) \,=\,11$
Find $f(x)$
We have: . $f'(x) \;=\;9x^{\frac{1}{2}} + 5x^{\frac{3}{2}}$
Integrate: . $f(x)... | 5 | [
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... | 33,883 | 33883 | |
Gradient of a Scalar Field
Top
Gradient of a Scalar field is often used to express the inclination of any line. Slope is Graphical representation of changes in Position of any quantity in space.
Suppose that a scalar quantity is represented by 'A'. Value of 'A' depends upon its position in space. In other words we ca... | 4 | [
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0.0432128906... | 33,884 | 33884 | |
Compouind interest
April 2nd 2008, 11:08 AM #1
Newbie
Joined
Mar 2008
Posts
20
Compouind interest
1. A relative has decided to establish a bank account for your newborn daughter that will pay for some of her future college expenses. It is intended that the amount be worth $10,000 18 yrs. from
now. As... | 4 | [
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Trig Indentity Help (Proof)
$[cot X/(1-tan X)] + [tan X/(1-cot X] = 1+ tan X + cot X$
I tried this with no luck... tried multiplying out by the conjugates and then LCD's, but nothing...
$\frac{{\cot x}}<br /> {{1 - \tan x}} + \frac{{\tan x}}<br /> {{1 - \cot x}} = \frac{{\dfrac{{\cos x}}<br /> {{\sin x}}}}<br /> {{\d... | 4 | [
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0.00039672851562... | 33,886 | 33886 | |
Homework Help
Posted by Taylor on Monday, November 2, 2009 at 10:43am.
What is the angular momentum of a 3.7kg uniform cylindrical grinding wheel of radius 25cm when rotating at 1500rpm?
How much torque(in magnitude) is required to stop it in 5.0s?
Could you explain this in detail, I don't really understand torque a... | 4 | [
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0.... | 33,887 | 33887 | |
Problem Solving
October 19th 2008, 11:30 PM #1
Junior Member
Joined
Feb 2008
From
Victoria
Posts
39
Problem Solving
Please help. A farmer was asked how many cows he had on his property. He replied that he was unsure, but he knew that when he counted them by twos, threes, fours, fives or sixes, he alw... | 4 | [
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Math To: Reiny
Posted by Maya on Wednesday, September 18, 2013 at 10:39pm.
This is one whole question:
(12) (10xy^3) (3x^2y^2) (5x) (2y)
I don't know how to do any of these:
simplify sqaure root of 160000
simplify sqaure root of 0.04
simplify 3 * square root 81
simplify square root of 900
simplify square root o... | 4 | [
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0.0027465820312... | 33,889 | 33889 | |
Simple algerbra problem
September 20th 2012, 09:21 AM #1
Newbie
Joined
Sep 2012
From
Ireland
Posts
2
Simple algerbra problem
Hi everyone,
i know i am way out of my league being on this forum but i am a mature student looking to get into college & for the corse i want i ned to repeat my maths exam... | 4 | [
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Sets and Venn Diagram problem
June 18th 2008, 01:22 AM #1
Newbie
Joined
Jun 2008
Posts
6
Sets and Venn Diagram problem
Illustrate [A-(B U C)] intersection [B - (A U C)] intersection [C-(A U B)] using a Venn Diagram. Explain the result by simplifying the expression analytically.
Thanks
if $x \in... | 4 | [
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help understanding basis and dimension
March 11th 2011, 03:26 PM #1
Junior Member
Joined
Sep 2009
Posts
28
help understanding basis and dimension
I am working on the following two problems:
Consider the subset U = {(x1,4x1-7x2,x2) : x1, x2 are real numbers} of R^3
Assume that U is a subspace of... | 5 | [
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Solving when a circle and rotating line collide
November 8th 2010, 11:17 AM #1
Newbie
Joined
Nov 2010
Posts
9
I am trying to solve for when a circle and a line rotating about a point will collide:
Updated:
I am trying to solve for T.
The arrow from Bo to B represents Bv or the velocity of t... | 5 | [
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Linear Algebra: Matrices and Systems Equations
September 1st 2007, 10:25 PM
googoogaga
Linear Algebra: Matrices and Systems Equations
Hello. Could anyone please help me step by step in solving the following homework problems. I tried to work on it twice (especially the first problem) but I just can't seem to fin... | 5 | [
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Intersection of two functions
September 18th 2010, 08:44 PM #1
Member
Joined
Mar 2009
From
Gold Coast, Queensland, Australia
Posts
105
Intersection of two functions
Hi
How would one go about finding the intersects of these functions?
$5.5\sqrt{x} + 10000 = C$ and $3.29x = R$
So I made R... | 4 | [
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Solving Optimal Control Problem of Monodomain Model Using Hybrid Conjugate Gradient Methods
Mathematical Problems in Engineering
Volume 2012 (2012), Article ID 734070, 14 pages
http://dx.doi.org/10.1155/2012/734070
Research Article
Solving Optimal Control Problem of Monodomain Model Using Hybrid Conjugate Gradient Me... | 5 | [
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Volume of a Prolate Ellipsoid
Date: 07/07/99 at 10:32:06
From: William Hansen
Subject: Calculation of Volume using areas and length
I have researched the equation for a prolate ellipsoid, which
resembles closely the left atrial chamber of the heart. Could you
explain how the equation for a prolate ellipse:
V =... | 5 | [
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... | 33,897 | 33897 | |
Summation of 1/i^2
Hi guys, The summation of i^2= n*(n+1)*(2n+1)/6 What is the summation od 1/i^2 ? Thanks for your help. rxt5972
I saw your other double post. I agree with the response there. You have been given an honest and correct answer, However, I will give you a different answer. The infinite series (sum) is: $... | 5 | [
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... | 33,898 | 33898 | |
Trigonometric Functions - finding the surface Area(found already) and volume of cone
May 1st 2008, 12:19 AM
KavX
Trigonometric Functions - finding the surface Area(found already) and volume of cone
This question is way over my head, its the last question in my txt book for this chapter and the only one I dont fu... | 4 | [
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... | 33,899 | 33899 |