content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Homework Help
Posted by Tammy Evert on Friday, July 7, 2006 at 11:35pm.
2x + 3y = 6
What is the question? You cannot solve for both x and y without a second independent equation, but you can express one variable in terms of the other. For example,
2x = 6 - 3y, so
x = -3y/2 + 3
solve each literal equation for the i... | 4 | [
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0.0257568359375,
0.039306640625,
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-0.0135498046875,
-0.07177734375,
-0.01190185546875,
0.00970458984375,
-0.03466796875,
-0.0013275146484375,
-0.000774383544921875,
0.0732421875,
0.13671875,
-0.140625,
... | 33,300 | 33300 | |
Recursive Formulas & Sequences
April 30th 2009, 05:39 PM
helpme
Recursive Formulas & Sequences
Directions tell me to provide a recursive formula for the sequence and to specify what type of sequence it is.
1] 1,1,2,3,5,8
2] 5,10, 20, 40, 80, 160
I understand the patterns & how they derived the ter... | 4 | [
-0.091796875,
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0.002288818359375,
0.007415771484375,
0.0206298828125,
-0.018798828125,
0.047119140625,
-0.033203125,
-0.0303955078125,
-0.01361083984375,
0.03173828125,
-0.0400390625,
0.026123046875,
-0.0005378723144531... | 33,301 | 33301 | |
Trig general solution
I have a risk at these two Trigonometric equation to find out the general solution. $1.\ sin2x-cos2x-sinx+cosx=0\\ \ 2.\ 4cos3x-sin2xcosx=0$
Principal general solutions in the complex plane found as follows: Substitute sin() & cos() functions with their equivalents in complex plane: $z=x+\text{i ... | 5 | [
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0.0361328125,
-0.0266113... | 33,302 | 33302 | |
URGENT HELP!!! lol (Trig Problems)
May 3rd 2009, 04:27 PM #1
Newbie
Joined
May 2009
Posts
2
1. (sinx/1+sinx) - (sinx/1-sinx)
2. tanx(cotx-cosx) = ?
3. cos4x
4. (tanx+1)(2sinx-sqrt3) = 0
5. sin2x + sinx = 0
6. sin^2(2)x=1
If yall could help me that would be great, i really jus... | 4 | [
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-0.00811767578125,
0.01300048828125,
-0.01385498046875,
0.043701171875,
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0.01025390625,
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0.0517578125,... | 33,303 | 33303 | |
Anti-derivative
I am having trouble with this one. e^4x - (cosx)^2 :confused: We just started doing these and im lost lol
Ah thanks for that identity. So I came up with F = 1/4 (e^(4x)) - 1/2 * x - 1/2 (sinx) + C :o
int{e^4x - (cosx)^2}dx = int{e^4x - (1 + cos2x)/2}dx .................................= int{e^4x}dx - ... | 5 | [
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0.0074462890625,
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0.02978515625,
... | 33,304 | 33304 | |
axis of pulley?
May 1st 2005, 02:27 PM #1
Newbie
Joined
May 2005
From
Christchurch kiwiland
Posts
7
axis of pulley?
I am stuck on a simple question that I belive could be a trick.
it says -
A 50kg body hangs at rest from a rope wrapped around a pully 15cm in diameter. what is the torque abou... | 4 | [
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-0.051513671875,
-0.0524... | 33,305 | 33305 | |
Weird Related Rates problem
April 14th 2009, 07:21 PM #1
Member
Joined
Sep 2008
Posts
126
A coffeepot has a cylinder shape with radius 5 inches. Let h be the depth of the coffee in the pot, measured in inches, where h is a function of time t, measured in seconds. The volume V of
coffee in the pot is c... | 4 | [
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Squares in triangles ?
November 27th 2012, 12:17 PM
mathsforce
Squares in triangles ?
Hi everyone !
I've got some trouble...
IJKL is a square and [IJ] is confunded with [BC]
h is the height from A.
C1 is the red square
C2 is the green square
C3 is the blue square
a= [BC]
b= [CA]... | 5 | [
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Routines for Conway and pseudo-Conway polynomials.
Bases: sage.structure.sage_object.SageObject
A pseudo-Conway lattice over a given finite prime field.
The Conway polynomial \(f_n\) of degree \(n\) over \(\Bold{F}_p\) is defined by the following four conditions:
□ \(f_n\) is irreducible.
□ I... | 4 | [
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-0.01... | 33,308 | 33308 | |
A Compound Fuzzy Disturbance Observer Based on Sliding Modes and Its Application on Flight Simulator
Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 913538, 8 pages
http://dx.doi.org/10.1155/2013/913538
Research Article
A Compound Fuzzy Disturbance Observer Based on Sliding Modes and Its Applicati... | 4 | [
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Composition of Maps
August 23rd 2009, 08:20 PM
Roam
Composition of Maps
Let $A,B$ be sets and let $f:A \rightarrow B$ and $g,h:B \rightarrow A$ be functions.
(1) Suppose $h o f$ is an injective map from $A$ to itself. Show that $f$ is injective.
(2) Suppose now that $f o g = 1_{B}$ and $hof = 1_{A}$. S... | 5 | [
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Homework Help
Posted by Anna on Monday, November 19, 2012 at 10:46pm.
A plane is capable of flying 200 km/h. There is a wind of 90 km/h from the east. The pilot flies in a northwest direction relative to the ground for three hours from city A to city B. Find the speed
of the plane relative to the ground, the heading o... | 4 | [
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Inverse operators
Hey I need to solve this problem by means of inverse operators: y''-3y'+2y=x Thank you!
Just FYI your questions are very vague. I think this is what you mean... $\displaystyle y''+3y'+2y=x \iff (D^2+3D+2)y=x$ Solving for y gives $\displaystyle y=\frac{1}{(D+1)(D+2)}[x]$ Since $x$ is a
polynomial we c... | 5 | [
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Journal of the Brazilian Society of Mechanical Sciences
Services on Demand
Article
Indicators
Related links
Share
Print version ISSN 0100-7386
J. Braz. Soc. Mech. Sci. vol.22 n.3 Campinas 2000
http://dx.doi.org/10.1590/S0100-73862000000300008
Nonlinear Dynamics and Control of Multibody Systems
Fernando A. Ro... | 4 | [
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... | 33,313 | 33313 | |
Preference relation that is represented by a utility function problem
February 11th 2011, 06:34 AM #1
Newbie
Joined
Sep 2009
From
Athens, Greece
Posts
20
Preference relation that is represented by a utility function problem
I have a problem and i'm stuck already...
Given a preference relation $\p... | 5 | [
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0.07763671875,
0.043701171875,
0.01318359375,
0.016357421875,
0.08154296875,
-0.0957031... | 33,314 | 33314 | |
A logaritm problem from an old trig textbook
December 10th 2012, 05:44 PM
Crisor2431
A logaritm problem from an old trig textbook
The equation is a logarithm problem that reads:
(a^2)(e^-ax)-(b^2)(e^-bx)=0 where a>b
The answer is:
(2(log[base e]a-log[base e]b))/(a-b)
How do I get from the pro... | 5 | [
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-0.05151367... | 33,315 | 33315 | |
Math Help
April 11th 2007, 06:55 AM #1
Member
Joined
Nov 2006
From
chicago
Posts
156
vector
If u = 3i + 2j and v = -5i + 3j, find
1.)the vector projection of v onto u.
2.)the vector projection of u onto v.
for #1, is it < -27/13 , -18/13 >
the vector projection of v onto u is give... | 4 | [
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-0.0164794921875,... | 33,316 | 33316 | |
Inverse proof
September 26th 2012, 10:37 PM #1
Super Member
Joined
Feb 2008
Posts
535
Inverse proof
I'm asked to prove (a1 a2 a3 ... an) ^-1 = (an^-1 ... a1^-1)
Here's my induction proof. Please critique and let me know what needs changed or improved.
Base: n=1: (a1)^-1 = a1^-1 by def of invers... | 5 | [
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-0.... | 33,317 | 33317 | |
Show that if m > n then ((a^2)^n) + 1 divides ((a^2)^n)− 1
November 5th 2009, 01:05 PM
sirellwood
Show that if m > n then ((a^2)^n) + 1 divides ((a^2)^m)− 1
Working through a question i got to this stage where i need to:
Show that if m > n then ((a^2)^n) + 1 divides ((a^2)^m)− 1
Should i be looking to ... | 5 | [
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0.026733398... | 33,318 | 33318 | |
Proof of the formula for the probability in a region
Hi Post-its!
Post-its
I like Serena:
I haven't learned a formal way of dealing with infinitesimals, so I don't really understand that definition. I became very confused when I tried to think of the rationale for it.
Karax:
So if [itex]B[/itex] is the region [it... | 4 | [
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0.0595703125,
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... | 33,319 | 33319 | |
Help with checking Vector Question
May 16th 2010, 03:28 PM #1
Newbie
Joined
May 2010
Posts
12
Help with checking Vector Question
Hey guys I am not sure if i am on the right track here so i need some advice
Question is:
if $\vec{a}=3i-2j$ , $\vec{b}=-4i+4j$ , and $\vec{c}=6i+-9j$ express the fol... | 4 | [
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Don't Have A Clue!!
November 28th 2006, 04:28 PM #1
steph
Guest
Don't Have A Clue!!
Financial Math
How much should be invested at 8% compounded semiannually in order to have $5000 at the end of 8 years?
Hello, steph!
You're expected to know the compound interest formula:
. . $A \;= \;P(1 + i)^... | 4 | [
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Integration of Product of e, with variable exponent, and a trigonometric function
July 25th 2012, 06:12 PM #1
Newbie
Joined
Jul 2012
From
Nowra, Australia
Posts
5
Integration of Product of e, with variable exponent, and a trigonometric function
I have been asked to find the definite integral, as desc... | 5 | [
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differential and proof
January 22nd 2007, 03:04 PM #1
Hey guys!
How would you solve the following:
1) If $y = e^{-kt}(Acoshqt +Bsinhqt)$ [A, B, k, q are constants]
show that $\frac{d^2y}{dt^2} + 2k\frac{dy}{dt} + (k^2 - q^2)y=0$
2) Find $\frac{dy}{dx}$ when $y = tanh^{-1}\left(\frac{2x}{1+x... | 5 | [
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0.02880859375,
0.001708984375,
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-... | 33,323 | 33323 | |
Fixed Point of a New Three-Step Iteration Algorithm under
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 560258, 9 pages
http://dx.doi.org/10.1155/2013/560258
Research Article
Fixed Point of a New Three-Step Iteration Algorithm under Contractive-Like Operators over Normed Spaces
^1Department of Mathema... | 5 | [
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0... | 33,324 | 33324 | |
Existence of Some Semilinear Nonlocal Functional Differential Equations of Neutral Type
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 503656, 12 pages
http://dx.doi.org/10.1155/2013/503656
Research Article
Existence of Some Semilinear Nonlocal Functional Differential Equations of Neutral Type
Departme... | 5 | [
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Application of derivatives
November 14th 2008, 04:15 PM
pankaj
Application of derivatives
Let $f(x)$ be a thrice continuously differentiable function.Prove or disprove that between two consecutive roots of $f'''(x)=0$ there exist atmost $4$ roots of $f(x)=0$
November 14th 2008, 05:47 PM
NonCommAlg
it's ju... | 4 | [
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0.01031494140625,
0.0673828125,
0.0556640625,
0.01611328125,
-0.027099609375,
0.007720947265625,
0.03857421875,
-0.11279296875,
0.0242919... | 33,326 | 33326 | |
ocumentation
Compaq Portable Mathematics Library
1.5 IEEE Std 754 Considerations
The Institute of Electrical and Electronics Engineers (IEEE) ANSI/IEEE Std 754-1985, IEEE Standard for Binary Floating-Point Arithmetic data types include ... | 4 | [
-0.061279296875,
0.049560546875,
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0.03564453125,
0.0400390625,
0.0174560546875,
0.1015625,
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0.02978515625,
-0.0419921875,
-0.00008869171142578125,
-0.03125,
-0.059814453125,
0.00241088867... | 33,327 | 33327 | |
Finding the zeros and intercepts---help / check answer?
September 15th 2008, 03:34 PM
tiar
Finding the zeros and intercepts---help / check answer?
Hi, again I am rusty at math (I haven't done it in two years). There are no solutions in my book for my homework, so could someone double check that I have the right ... | 4 | [
-0.03125,
-0.035888671875,
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0.056640625,
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0.0220947265625,
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0.0986328125,
-0.07275390625,
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0.017578125,
0.0164794921875,
0.034912109375,
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-0.09228515625,
... | 33,328 | 33328 | |
Binomial ,with replacement
February 20th 2011, 06:56 AM #1
Junior Member
Joined
Jul 2009
Posts
49
Binomial ,with replacement
found this question on a website , it gives the answer as 0.27
but it doesn't show how the author arrived at the answer
ive never dealed with replacement before
A bag... | 4 | [
0.04541015625,
0.00469970703125,
0.05322265625,
0.038818359375,
-0.01165771484375,
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0.150390625,
-0.017822265625,
0.02880859375,
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-0.0194091796875,
0.03369140625,
0.041748046875,
0.00004982948303222656,
0.06591796875,
0.00125885009... | 33,329 | 33329 | |
2 quick matrix questions.
January 24th 2010, 12:32 PM #1
Member
Joined
Dec 2009
Posts
83
2 quick matrix questions.
1) let
A= (a b)
.....(c d)
with none of a,b,c,d =0
If A is such that ad-bc=0, show the matrix equation AX+XA=0 has a solution X with X a non-zero 2x2 matrix that relies on 1... | 5 | [
-0.1220703125,
0.0036773681640625,
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0.029296875,
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0.08984375,
-0.0703125,
-0.03002929687... | 33,330 | 33330 | |
Prove composite number has a prime divisor
January 25th 2011, 04:08 PM #1
Senior Member
Joined
Apr 2008
From
Vermont
Posts
318
Prove composite number has a prime divisor
Prove that if integer n>=2 is composite, then n has a prime divisor which is <=(n)^1/2
My first thought was to somehow use th... | 4 | [
0.0021209716796875,
0.002685546875,
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0.032958984375,
... | 33,331 | 33331 | |
Please help with this word problem
October 25th 2008, 12:43 PM #1
Junior Member
Joined
Oct 2008
Posts
26
Please help with this word problem
A picture frame measures 20 in by 8 in. There is 115 in^2 of the picture showing. The frame is of uniform thickness. Find the thickness of the frame.
Reply
Let... | 4 | [
0.03662109375,
0.12255859375,
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0.05810546875,
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0.026611328125,
-0.01214599609375,
-0.0078735351... | 33,332 | 33332 | |
Homework Help
Posted by suzi on Saturday, February 26, 2011 at 2:57pm.
1) 1+cos(3t)/ sin(3t) + sin(3t)/( 1+ cos(3t))= 2csc(3t)
2) sec^2 2u-1/ sec^2 2u= sin^2 2u
3) cosB/1- sinB= secB+ tanB
• Math Help - Reiny, Saturday, February 26, 2011 at 3:07pm
Please type your equations using brackets to show the proper ... | 4 | [
-0.06884765625,
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0.0172119140625,
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-0.040771484375,
-0.1142578125,
0.01... | 33,333 | 33333 | |
Homework Help
Posted by Sophie on Tuesday, June 2, 2009 at 3:48pm.
Find an equation of the line that bisects the obtuse angles formed by the lines with equations 3x-y=1 and x+y=-2.
a. (3√2 +√10)x-(√10 + √2)y-2√10+√2=0
b. (3√2 - √10)x+(√10 - √2)y+2√10+√2=0
c. (3√2 + √10)x+(√10 - √2)y+2√10 - √2=0
d. (3√2 + √10)x-(√1... | 4 | [
-0.11376953125,
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0.06494140625,
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0.08984375,
-0.05908203125,
-0.0256347656... | 33,334 | 33334 | |
Homework Help
Posted by ladybug on Monday, October 1, 2012 at 11:23pm.
form a polynomial f(x) with real coefficients having the given degree and zeros. degree 5; zeros -7; -i;-9+i
enter the polynomial.
f(x)=a(?)
• pre-calculus - Reiny, Tuesday, October 2, 2012 at 9:19am
Complex numbers always appear as conju... | 4 | [
-0.10546875,
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0.045166015625,
-0.0... | 33,335 | 33335 | |
Homework Help
Posted by Jamie on Tuesday, January 16, 2007 at 4:55pm.
Let f be a function defined by f(x)= arctan x/2 + arctan x. the value of f'(0) is?
It's 3/2 but I am not very clear on how to obtain the answer. I changed arctan x/2 into dy/dx=(4-2x)/(4sqrt(4+x^2)) but that's as far as I got. Could you please show... | 4 | [
-0.01153564453125,
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0.0159912109375,
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-0.0189208984375,
0.00251... | 33,336 | 33336 | |
Maximum and minimum of a function of 2 variables (Lagrange multipliers)
June 4th 2009, 05:13 PM #1
Maximum and minimum of a function of 2 variables (Lagrange multipliers)
My question is : Can I solve the problem without passing by Lagrange multipliers? Because I have some difficulties by doing so. If not, then I ... | 4 | [
0.060546875,
-0.07861328125,
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0.0791015625,
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0.00927734375,
-0.04... | 33,337 | 33337 | |
conical glass
July 28th 2009, 12:45 AM
pacman
conical glass
A conical glass of depth h and generating angle A, there is carefully dropped spherical iron ball of such size as to cause the greatest overflow.
Show that the radius of the sphere is equal to (h sin A)/(sin A + cos 2A).
July 28th 2009, 12:26 PM
O... | 5 | [
0.003997802734375,
0.0830078125,
0.0164794921875,
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... | 33,338 | 33338 | |
Homework Help
Posted by Amy on Tuesday, September 4, 2012 at 8:34pm.
I need help evaluation the following:
1.) (1/15)^2.309
It says hint: set the expression = x and take the logs of both sides.
I did: x=(1/15)^2.309
logx = log(1/15)^2.309 = 2.309 log(1/15)
and I don't know how to proceed or if I'm on the right tr... | 4 | [
0.035888671875,
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0.03515625,
-0.1259765625,
0.03295... | 33,339 | 33339 | |
M
Dwarf Tossing in D&D (Part 1)
Warning: the following column has been rated MP-13 for gratuitous algebra and excessive equations.
This month, I'm going to climb down from my ivory tower and get a little more "applied" than usual. You see, I need some rules for a game I'm playing right now. I'm playing in the epic-le... | 5 | [
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0.058349609375,
-0.04809570... | 33,340 | 33340 | |
Inequality puzzle
February 16th 2011, 01:06 PM #1
Member
Joined
Sep 2009
Posts
177
Thanks
1
Inequality puzzle
Prove that $\forall n \epsilon N, \prod_{i=1}^{n}(1+x^{2^i})<\frac{1}{1-x}$
0<x<1
I know of 2 proofs. One, which is mine, and anouther that is better. Try to find both!
I think t... | 5 | [
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0.0869140625,
0.046875,
-0.1015625,
... | 33,341 | 33341 | |
Math Help
Calculate this limit ( n ــــ > + infinity ) : $<br /> \frac{n!e^{n}}{n^{n+\frac{1}{2 }}}<br />$
Hello, dhiab! $\lim_{x\to\infty} \frac{n!e^{n}}{n^{n+\frac{1}{2 }}}<br />$ Ratio Test: . $\left|\frac{a_{n+1}}{a_n}\right| \;\;=\;\;\left|\frac{(n+1)!e^{n+1}}{n^{n+\frac{3}{ 2}}} \cdot \frac{n^{n+\
frac{1}{2}}}{... | 5 | [
-0.040283203125,
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-0.0032958984375,
0.01269... | 33,342 | 33342 | |
Calculus: implicit differentiation
Posted by Anonymous on Thursday, October 3, 2013 at 12:19pm.
Find dy/dx by implicit differentiation
1. x^3 -xy+ y^2= 7
The given answer is (y-3x^2)/ (2y-x), but I'm not getting it.
2. How would I do this one? If I couldn't do the above one, which looks a heck of a lot simpler, I d... | 4 | [
-0.0419921875,
-0.080078125,
-0.01446533203125,
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0.01544189453125,
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0.0147705078125,
0.125,
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0.06689453125,
0.07666015625,
0.04736328125,
-0.134765625,
-0.0076904296875,
... | 33,343 | 33343 | |
Circular Functions
June 4th 2008, 10:29 PM #1
Newbie
Joined
Dec 2007
Posts
9
Circular Functions
Hey Ive got two questions regarding Cicular Functions, could you possibly include some working as I am really struggling with this topic:
I need to find the next four values for (t):
6=3sin(2t)+3
... | 4 | [
-0.037109375,
0.006622314453125,
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0.04833984375,
0.07666015625,
-0.052490234375,
0.003265380859375,
-0.052... | 33,344 | 33344 | |
Homework Help
Posted by janice on Friday, November 16, 2012 at 6:28am.
Find all solutions to the following triangle. (Round your answers to one decimal place. If either triangle is not possible, enter NONE in each corresponding answer blank.)
A = 115.2¡ã, a = 43.6 cm, b = 23.1 cm
First triangle (assume B ¡Ü 90¡ã):
... | 4 | [
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0.035400390625,
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-0.02294921875,
-0.08251953125,
-0.040771... | 33,345 | 33345 | |
Homework Help
Posted by Jake on Sunday, April 3, 2011 at 2:35pm.
An object with mass 0.250 kg is acted on by an elastic restoring force with force constant 10.8 N/m. The object is set into oscillation with an initial potential energy of 0.150 J and an initial
kinetic energy of 6.00×10−2 J.
What is the amplitude of os... | 4 | [
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-0.03173828125,
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0.006256103515625,
0.011474... | 33,346 | 33346 | |
height of a mountain with different elevations
May 4th 2010, 06:41 PM
mikeyb
height of a mountain with different elevations
hello everybody,
i got a height of a mountain problem but with a little twist. thanks for any help in advance.
Determine the elevation (height above sea level) of the top of a mou... | 4 | [
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0.078125,
0.029541015625,
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-0.1181640625,
0.046875,
... | 33,347 | 33347 | |
Calculating a the % of a number to give you a desired result
December 21st 2009, 10:38 AM #1
Newbie
Joined
Dec 2009
Posts
6
Calculating a the % of a number to give you a desired result
Hello,
I am trying to come up with a formula (or use an existing one) to calculate a certain percentage (known) of ... | 4 | [
0.0101318359375,
0.00408935546875,
0.01416015625,
-0.0012664794921875,
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0.033935546875,
0.1025390625,
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0.022216796875,
0.0478515625,
0.0615234375,
0.0286865234375,
-0.03466796875,
0.051... | 33,348 | 33348 | |
Math Help
February 3rd 2010, 05:53 AM #1
Groups
Hello, I was wondering if I could get some help with this question.
Let G be the subgroup of $S_4$ generated by (1 2),(3 4) and (1 3)(2 4). Let H be the subgroup of S_4 generated by (1 2) and (3 4). Show that H is a normal subgroup of G. Show that H has order ... | 5 | [
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-0.10888671875,
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0.0218505859375,
0.0164794921875,
-0... | 33,349 | 33349 | |
Differentiation Problems
February 27th 2009, 01:59 AM #1
Newbie
Joined
Feb 2009
Posts
11
Differentiation Problems
Hi,
I am in my late 20's and am going for an interview next week where I am required to do a maths test (arrgghh!) I havent done maths now in nearly 10 years but I was quite good at the ... | 5 | [
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0.00518798828125,
-0.0308837890625,
0.0... | 33,350 | 33350 | |
The Hume Linear Algebra Tcl Package
The Hume Linear Algebra Tcl Package, La
The package consists of Tcl procedures for the manipulation of vectors and matrices. The functionality spans scaling, normalization, concatenation by rows or columns, subsetting by rows or columns,
formatted printing, transpose, dot product,... | 4 | [
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0.01324462890625,
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0.01806640625,
-0.0162353515625,
... | 33,351 | 33351 | |
Homework Help
Posted by laura on Saturday, December 29, 2012 at 8:16am.
integrate by parts
integrate (4+x^2)^1/2
• maths - Steve, Saturday, December 29, 2012 at 12:53pm
I'd do a trig substitution first:
x = 2tanθ
4+x^2 = 4+tan^2θ = 4sec^2θ
dx = 2sec^2θ dθ
and the integral is now
∫2secθ ... | 5 | [
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0.04150390625,
0.0385... | 33,352 | 33352 | |
On the Paley-Wiener theorem
up vote 8 down vote favorite
3
Is there any even Schwartz function whose restriction to $[0,\infty)$ is monotone and whose Fourier transform is compactly supported? In other words, is there any entire analytic function satisfying
the condition of the Paley-Wiener theorem that is even on the... | 5 | [
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0.05908203125,
-0.07763671875,
-0.... | 33,353 | 33353 | |
help me to convolute non central chi-square with white Gaussian distribution
August 24th 2012, 04:03 PM #1
Newbie
Joined
Aug 2012
From
United States
Posts
3
help me to convolute non central chi-square with white Gaussian distribution
Hi, I am doing research and i am stuck at this point I need help... | 4 | [
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Asymptotes of a function
September 19th 2009, 11:31 PM #1
Asymptotes of a function
y = (2x)/(x+1) When solving for the horizontal asymptote and substituting infinity in for x, infinity just crosses out and i'm left with 2/1 making the horizontal asymptote y = 2. right?
Last edited by mr fantastic; September ... | 4 | [
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trig help
B=5 deg C=125 deg b=200 round to the nearest tenths and lengths
Hello, Shorty! I assume the instructions are "Solve the triangle". You're expected to be familiar with the Law of SInes: . . $\frac{a}{\sin A} = \frac{b}{\sin b} = \frac{c}{\sin C}$ $B = 5^o,\;C =
125^o,\;b = 200$ Round to the nearest tenth. I p... | 4 | [
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Velocity as a function of time
September 18th 2009, 01:46 PM #1
Junior Member
Joined
Mar 2009
Posts
41
Velocity as a function of time
Please explain how to interpret this graph as well as the rest of the problem. Thank you!
Two horizontal forces xy coordinate system is laid out. Force x axis and h... | 4 | [
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0.0390625,
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Experimental and Analytical Studies on Improved Feedforward ML Estimation Based on LS-SVR
Discrete Dynamics in Nature and Society
Volume 2013 (2013), Article ID 192021, 10 pages
http://dx.doi.org/10.1155/2013/192021
Research Article
Experimental and Analytical Studies on Improved Feedforward ML Estimation Based on LS... | 4 | [
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Lie-Algebraic Approach for Pricing Zero-Coupon Bonds in Single-Factor Interest Rate Models
Journal of Applied Mathematics
Volume 2013 (2013), Article ID 276238, 9 pages
http://dx.doi.org/10.1155/2013/276238
Research Article
Lie-Algebraic Approach for Pricing Zero-Coupon Bonds in Single-Factor Interest Rate Models
In... | 5 | [
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Triangle T has vertices of (-2,6), (6,2) and (0,k) where k
Author Message
TAGS:
Triangle T has vertices of (-2,6), (6,2) and (0,k) where k [#permalink] 12 Jul 2012, 16:29
... | 4 | [
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Homework Help
Posted by Nadine on Monday, December 14, 2009 at 9:03am.
What is the orthogonal trajectory of y^2 - x^2 = C ??
• Calculus - MathMate, Monday, December 14, 2009 at 10:00am
Using implicit differentiation, find the slope of the tangents
y'=x/y
The slopes of the normals are therefore:
y'=... | 5 | [
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given tetrahedral region and evaluate triple integral
March 4th 2011, 02:16 AM
maximus101
given tetrahedral region and evaluate triple integral
Let
$W \rightarrow \Re^3$ be the tetrahedral region
{ $(x, y, z) | x \ge 0, y \ge 0 , z \ge 0; x + y + z \le 1$}
Evaluate
$\iiint\limits_W \ (x + y + 2z)... | 5 | [
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... | 33,362 | 33362 | |
Separable Partial ODE
November 4th 2008, 05:37 AM #1
Newbie
Joined
Nov 2008
Posts
1
Separable Partial ODE
Find the general solution of:
x.du/dx - (1/2).y.du/dy=0
I know that for it to be separable u(x,y)=X(x)Y(y)
so:
x.Y(y)dX/dx + (1/2).X(x)dY/dy = 0
which cancels to:
x/X(x)... | 4 | [
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Proof by induction: 7^n + 2 is divisible by 3
May 24th 2013, 07:05 PM #1
Proof by induction: 7^n + 2 is divisible by 3
Use Proof by Mathematical induction to prove that 7^n + 2 is divisible by 3 for all n in the Natural Numbers.
First thing I guess is to label the equation;
$p(n) = 7^n + 2$
And the... | 4 | [
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0.02... | 33,364 | 33364 | |
Calculating Interest
September 29th 2009, 01:38 PM #1
Junior Member
Joined
Sep 2008
Posts
41
Calculating Interest
A) Find the interest rate needed for an invesment of 22000 dollars to grow to an amount of 32750 dollars in 7 years if the interest is compounded monthly?
I got 4.98% can someone varify?
... | 4 | [
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Show that an object is a tensor
March 23rd 2011, 07:12 PM
davesface
Show that an object is a tensor
Suppose that an object with two indices has the property that $A(\mu,u)C^{\muu}$ is a scalar for any arbitrary tensor $C^{\muu}$. Show that $A(\mu,u)$ is a tensor.
Hint: start with the relationship $A^{'u}_{... | 5 | [
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diophintine equation perhaps?
Are there integers m and n so that $m^{2} + (m+1)^{2} = n^{4} + (n + 1)^{4}$?
$m^2 + (m+1)^2 = n^4 + (n+1)^4$ Let $m= a- \frac{1}{2}$ , $n = b-\frac{1}{2}$ Substitute them into the original equation : $(a-\frac{1}{2})^2 + (a+\frac{1}{2})^2 = (b-\frac{1}{2})^4 + (b+\frac{1}{2})
^4$ $2a^2 +... | 5 | [
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0.0322265625,
... | 33,367 | 33367 | |
Colour Number Graph
June 1st 2011, 05:19 AM #1
Colour Number Graph
Hey, I'm a little stuck on the following problem:
Let $x_1,\cdots x_{kl+1}$ be n different real numbers. Show there exists a decreasing subsequence with at least k+1 terms, or a increasing sequence of at least l+1 terms. With as hint: $\chi(K... | 4 | [
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Recurrence Relations: Generating Functions
November 24th 2007, 07:47 PM #1
Newbie
Joined
Nov 2007
Posts
7
Recurrence Relations: Generating Functions
I was looking to figure out how to solve the following:
The recurrence relation: $a_{n}=4a_{n-1}-4a_{n-2}+4^{n}$
Given: $n\ge 2 , a_{0}=2 , a_{1} =... | 5 | [
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0.020751... | 33,369 | 33369 | |
Homework Help
Posted by Cassie on Tuesday, April 10, 2012 at 2:35am.
A square has a side length of 95. What is the length of the diagonal of the square? Express your answer in simplest radical form.
• Geometry - Bosnian, Tuesday, April 10, 2012 at 3:04am
Pitagorin teorem:
diagonal = sqrt ( 95 ^ 2 + 95 ^ 2... | 4 | [
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Maths Homework.
March 20th 2012, 02:42 AM
HollieMay2600
Maths Homework.
The height s metres of a mass thrown vertically upward at a time t seconds given by
S=40t-13t2
Show when 25m= 40t - 13t2, 13t2 - 40t + 25 = 0
There is something about what you do to one side you have to do to the other?
March... | 4 | [
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0.0233154296... | 33,371 | 33371 | |
Newton's Method of Approximation
June 13th 2011, 06:42 AM
purplec16
Newton's Method of Approximation
Use Newton's Method of Approximation to approximate the zero of the function in the indicated interval to six decimal places
$f(x)={x}^{3 }+3{x}^{ 2}-3$ in the interval $[-2,0]$
I know how to use Newton... | 5 | [
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-0.0064086914062... | 33,372 | 33372 | |
double integration help
November 4th 2011, 12:48 PM
acasas4
double integration help
This region in the first octant is bounded by the coordinate planes and the paraboloid x^2+y^2+z=4. If the volume of the region is given by the double integral
intgral from 0 to 2 integral from 0 to B (A dydx)
What is A?... | 4 | [
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-0... | 33,373 | 33373 | |
)-Expansion Method for the Space and Time Fractional Foam Drainage and KdV Equations
Abstract and Applied Analysis
Volume 2013 (2013), Article ID 414353, 7 pages
http://dx.doi.org/10.1155/2013/414353
Research Article
Improved ()-Expansion Method for the Space and Time Fractional Foam Drainage and KdV Equations
^1Dep... | 5 | [
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-0.00... | 33,374 | 33374 | |
Spatial Approximation of Nondivergent Type Parabolic PDEs with Unbounded Coefficients Related to Finance
Abstract and Applied Analysis
Volume 2014 (2014), Article ID 801059, 11 pages
http://dx.doi.org/10.1155/2014/801059
Research Article
Spatial Approximation of Nondivergent Type Parabolic PDEs with Unbounded Coeffi... | 4 | [
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... | 33,375 | 33375 | |
Symmetry Reduction of the Two-Dimensional Ricci Flow Equation
Geometry
Volume 2013 (2013), Article ID 373701, 6 pages
http://dx.doi.org/10.1155/2013/373701
Research Article
Symmetry Reduction of the Two-Dimensional Ricci Flow Equation
^1School of Mathematics, Iran University of Science and Technology, Narmak, Tehran... | 4 | [
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0.0373... | 33,376 | 33376 | |
Hermitian scalar product relationship
January 6th 2007, 11:34 AM #1
Newbie
Joined
Dec 2006
Posts
9
Hermitian scalar product relationship
Hi all i could use a little help. Thanks in advance.
Prove that if A is Hermitian than (Ax, y) = (x, Ay), where x and y are any vectors.
what ive tried:
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0.10205078125,
-0.0245361328125,
0... | 33,377 | 33377 | |
Why is this limit proof wrong?
November 20th 2007, 02:40 PM #1
Why is this limit proof wrong?
This may be a stupid question thats gonna easily be proved but i just wondered at which step is this wrong. This is taken from a proof in my uni class that limit x->3 (7x) = 21 but just changing
one number. why is it... | 4 | [
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NPV and IRR
October 30th 2009, 07:25 AM #1
Junior Member
Joined
Oct 2009
Posts
25
Am I allowed to open up several threads in one day when the other threads i opened have not been answered? because i have many topics I am stuck on, so I cant combine it into one? since they are
all different topics.
... | 5 | [
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Math Help
November 4th 2007, 07:58 PM #1
Junior Member
Joined
Oct 2007
Posts
56
optimization
Ok, I'm pretty lost on this one.
A farmer will produce a crop of soybeans between 0 and 250 tons. The price of P of a single ton of soybean is $500 minus twice the number of tons X that are produced, since ... | 5 | [
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... | 33,380 | 33380 | |
Hartshorne Definition Question
August 5th 2010, 08:39 AM
xboxlive89128
Hartshorne Definition Question
I have a question from Algebraic Geometry by Robin Hartshorne. Here is a proof in the textbook:
Theorem. Let $X$ be a variety and $Y \subseteq \mathbb{A}^n$ be an affine variety. Let $x_1, \ldots, x_n$ be t... | 5 | [
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0.046142578125,
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-0.044189453125,
0.023681640625,
0.10791015625,
-0.04248046875,
-0.080566... | 33,381 | 33381 | |
Partial Fractions
January 16th 2010, 12:38 PM
HNCMATHS
Partial Fractions
Hello,
Could someone please help me by telling me what the best way to resolve the following equation into three partial fractions is?
$6x^2 +5x -2<br /> \div<br /> x(x-1)(2x+1)$
January 16th 2010, 12:44 PM
e^(i*pi)
Quote:... | 4 | [
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consecutive integers help
December 2nd 2009, 04:28 PM #1
Junior Member
Joined
Apr 2008
Posts
73
find three consecutive integers such that the sum of the first and the third is 80?
the difference of two numbers is 46.the larger of the two numbers is 3 times the smaller. find the value of the two n... | 4 | [
0.00836181640625,
0.12353515625,
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-0.0240478515625,
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0.03... | 33,383 | 33383 | |
Math (please help!)
Posted by noel on Monday, June 11, 2012 at 12:10am.
1. θ is a first quadrant angle in standard position and cos 1/(sqrt10)= . Find the exact value of sin .
2. feta is a second quadrant angle in standard position and tan(feta) -((sqrt5)/2) = . Find the exact value of cos(feta) .
3. θ is an angle i... | 4 | [
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Determine a basis
February 27th 2010, 12:02 PM #1
Newbie
Joined
Mar 2008
Posts
9
Determine a basis
Let S be the vector space consisting of the set of all linear combinations of the functions
f1(x)= e^(x)
f2(x)= e^(-x)
f3(x)= sinh(x)
Determine a basis for S, and hence, find dim[S].
f... | 5 | [
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... | 33,385 | 33385 | |
Journal of the Brazilian Computer Society
Serviços Personalizados
Artigo
Indicadores
Links relacionados
Compartilhar
versão impressa ISSN 0104-6500
J. Braz. Comp. Soc. vol.11 no.3 Campinas abr. 2006
http://dx.doi.org/10.1007/BF03192383
A new approach for regularized image interpolation
S. E. El-Khamy^I; M. M.... | 4 | [
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If a is an element of order m in a group G and a^(k) = e, prove that m divides k.
April 2nd 2010, 09:58 PM
rainyice
If a is an element of order m in a group G and a^(k) = e, prove that m divides k.
If a is an element of order m in a group G and a^(k) = e, prove that m divides k.
April 3rd 2010, 12:30 AM
FancyM... | 4 | [
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0.0517578125,
-0... | 33,387 | 33387 | |
Proving a vector space
April 20th 2008, 05:04 PM #1
Member
Joined
Jun 2006
Posts
93
Proving a vector space
I've attached an image of my problem set. I'm confused about what they mean to define the operation of addition or scalar multiplication, do they mean which of the eight axioms? Thank you.
You ... | 4 | [
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probability using permutations/combinations
July 10th 2007, 05:03 PM
sam48
probability using permutations/combinations
A bag contains 4 red and 3 green blocks. 3 blocks are randomly selected from the bag. Determine the probability that all three are red given that
i.) replacement occurs between the second a... | 4 | [
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Prove a limit
September 12th 2009, 05:35 PM
cgiulz
Prove:
Limit as n --> infinity
n/(n^2+3n+1) -->0
I just don't know how to start here. What algebraic property can I use to get started?
Will this work?
|n/(n^2 +3n + 1)| < | n/(n^2 +3n)| < | n/(n^2)| = 1/n?
Thanks.
September 12th 20... | 5 | [
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find all polar coordinates
February 13th 2007, 05:18 PM
rcmango
find all polar coordinates
Find all polar coordinate pairs of the point with Cartesian coordinates:
(-4sqrt(3), 4)
thanks for any help you can give me.
February 13th 2007, 05:38 PM
ThePerfectHacker
Here I drew a hand drawn picture.
... | 4 | [
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prove limit by definition
November 5th 2010, 03:42 AM
drugcpp
prove limit by definition
Hello everyone, this is my first topic on this forum, so if by chance this question was asked in the past, redirect me to the relevant post.
So, I understand the definition of function limit, I just can't figure how to s... | 5 | [
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Find all cosets of {e,(1,2)} in S3
June 14th 2013, 12:24 AM #1
Junior Member
Joined
Apr 2011
Posts
29
Find all cosets of {e,(1,2)} in S3
Hello!
I am hoping if someone could please explain how to do this question as I cannot get my head around it.
Q1. Find all cosets of {e,(1,2)} in S3
> How... | 4 | [
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How to solve -2sin(t)+ cos(t) =0
October 23rd 2010, 09:30 AM #1
Junior Member
Joined
Sep 2010
Posts
32
How to solve -2sin(t)+ cos(t) =0
I have: -2sin(t)+ cos(t) =0
How can I find out what t is?
I dont even know how to start, because I havent done this in over 3 years..
Help would be apprec... | 4 | [
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Newest 'matrices' Questions
Questions where the notion matrix has an important or crucial role (for the latter, note the tag matrix-theory for potential use). Matrices appear in various parts of mathematics, and this tag is
typically combined with other tags to make the general subject clear, such as an appropr... | 4 | [
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-0.0223388671... | 33,395 | 33395 | |
solve the inequality
Solve this inequally $\frac{1}<br /> {x} + \frac{1}<br /> {{x + 2}} - \frac{1}<br /> {{x + 1}} \leqslant 0<br />$
Geherally the best way to solve a complicated inequality, like $\frac{1}{x}+ \frac{1}{x+2}\le \frac{1}{x+1}$ or, equivalently $\frac{1}{x}+ \frac{1}{x-2}-\frac{1}{x+1}\le 0$, is to so... | 4 | [
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0.05078125,
0.006256103515625,
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0.0032806396484375,
0.02600097... | 33,396 | 33396 | |
Statistics, averages and deviations.
January 3rd 2009, 07:22 PM
RossBrons
Statistics, averages and deviations.
A population consists of the five numbers 2,3,6,8 and 11. Consider all possible samples of 2 that can be drawn with replacement from this population (i.e. as soon as soon as number has been drawn
an... | 4 | [
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-0.0222167... | 33,397 | 33397 | |
Regarding Wilson's Theorem
July 14th 2010, 05:52 AM
Bingk
Regarding Wilson's Theorem
I was just wondering something
(p-1)! = -1 mod p
I was investigating the number (p-1)! + 1, which is divisible by p. I was wondering if n = ((p-1)! + 1)/p, then does the prime factorization of n consists of primes all ... | 5 | [
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... | 33,398 | 33398 | |
Inequality problem
June 5th 2009, 11:34 AM #1
Newbie
Joined
Mar 2009
Posts
8
Inequality problem
I made a simple model several weeks ago which led to a conjecture, which I have been unable to prove thus far.
Problem:
Given constants $s$ and $h$ such that
$0<s<h/2$,
functions $p(x)$ and $C... | 4 | [
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... | 33,399 | 33399 |