content string | quality_label int64 | meta string | all-MiniLM-L6-v2_embedding list | doc_id int64 | unique_id string |
|---|---|---|---|---|---|
Evaluating an integral interpreted as area...
April 29th 2013, 03:57 PM #1
Finishing the last chapter of Calculus 1, so go easy on me you guys :|
I know this is like the easiest and most obvious thing. I just can't figure it out though; I need help.
I don't know why the answer is 6Ο.
Evaluate β« from... | 5 | [
0.08984375,
-0.08740234375,
0.00634765625,
-0.017578125,
0.00555419921875,
-0.08642578125,
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0.060791015625,
0.054443359375,
-0.01434326171875,
-0.017333984375,
0.01416015625,
0.0247802734375,
-0.004730224609375,
-0.036865234375,
-0.02294921875,
0.031005859375,
-0.06... | 2,500 | 2500 | |
Supremums: sup AC = supA supC
February 25th 2010, 08:25 PM #1
Senior Member
Joined
Jan 2009
Posts
404
Supremums: sup AC = supA supC
If A and C are subsets of R, let AC={ac: a E A, c E C}. If A and C are bounded and the sets consist of strictly positive elements, prove that sup AC = supA supC.
Attemp... | 4 | [
-0.034423828125,
0.03466796875,
-0.0048828125,
0.035400390625,
-0.023681640625,
0.0361328125,
0.01416015625,
0.04833984375,
0.02587890625,
0.00750732421875,
-0.00098419189453125,
-0.0115966796875,
0.0654296875,
0.03369140625,
0.0228271484375,
-0.0024261474609375,
0.07275390625,
-0.... | 2,501 | 2501 | |
Orthogonality proof
March 11th 2007, 07:17 PM
buckaroobill
Orthogonality proof
i have a linera algebra quiz on this proof tomorrow so if anyone could show me how the following is done, i would be really thankful...
An orthogonal matrix is one for which A^T = A^-1 (meaning A transpose = inverse of A).
P... | 4 | [
-0.1484375,
-0.0206298828125,
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0.045166015625,
-0.05078125,
0.037353515625,
0.0791015625,
0.002960205078125,
0.12353515625,
0.0277099609375,
0.01904296875,
-0.049560546875,
0.07470703125,
-0.0081787109375,
0.03637695312... | 2,502 | 2502 | |
Finding the equation of lines
September 24th 2009, 04:55 PM #1
Junior Member
Joined
Sep 2007
Posts
43
Finding the equation of lines
A bit confused on this:
1. Find the equation of the line between the points (9, -9) and (-5, -2).
m=y2-y1 -2 - -9 7 = -1
--------- (over) --------- ---- ----
... | 4 | [
-0.048095703125,
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0.06689453125,
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0.038330078125,
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0.0242919921875,
-0.0087890625,
-0.039794921875,
0.11572265625,
-0.05859375,
-0.06298828... | 2,503 | 2503 | |
semisimple rings
July 2nd 2010, 02:07 PM #1
Member
Joined
Sep 2008
Posts
166
semisimple rings
If $R$ is a division ring and $V$ is a left vector space over $R$ with $dim(V)=n$, then $End_R(V)$ is isomorphic to $Mat_n(R^{op})$ and $End_R(V)$ is a left semisimple ring.
I already prove the part that $E... | 4 | [
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0.064453125,
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0.034912109375,
0.01708984375,
-0.039794921875,
0.010986328125,
0.08740234375,
0.... | 2,504 | 2504 | |
Pythagorean theorem and triangles Question
April 13th 2010, 04:16 PM #1
Member
Joined
Mar 2010
Posts
133
Pythagorean theorem and triangles Question
I need help with c) and d) and also e).
For c) they are asking for 2ΞΈ however I don't know what they did to get 1 - 2y^2.
d) Can you please exp... | 4 | [
-0.0849609375,
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0.00927734375,
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0.040771484375,
0.044921875,
0.054443359375,
0.07177734375,
0.0223388671875,
-0.006805419921875,
0.020751953125,
0.032470703125,
-0.033447265625,
-0.047607421875,
... | 2,505 | 2505 | |
Re: st: predict stdp after logistic regression;
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Re: st: predict stdp after logistic regression;
From May Boggess <mboggess@stata.com>
To statalist@hsphsun2.harvard.edu
Subject Re: st: predict stdp after logistic regression;
Date 27... | 5 | [
-0.0189208984375,
0.006103515625,
-0.01031494140625,
-0.0216064453125,
0.0203857421875,
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-0.049560546875,
0.0888671875,
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0.04248046875,
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-0.08935546875,
0.01275634765625,
-0.040771484375,
-0.021484375,
0.004913... | 2,506 | 2506 | |
Rearranging Equations
Hi, How would l go about re-arranging the following equation to find L? X = FL^3/3EI Thanks in advance.
Not sure if this is really what you are asking, but I am taking each of $X,F,E,L,I\in \mathbb{R}$ just variables in some equation. Note $E,Iot = 0$ or else you get division by 0. $X = \frac{FL^... | 4 | [
0.005096435546875,
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0.045166015625,
0.04833984375,
-0.0194091796875,
-0.1455078125,
0.0493164062... | 2,507 | 2507 | |
Homework Help
Posted by tania on Thursday, June 28, 2012 at 1:43am.
if $15,000 is invested at 6%, compounded quarterly, how long will it be before it grows to $25,000?
β’ Math - Reiny, Thursday, June 28, 2012 at 10:39am
25000 = 15000(1.015)^n , where n is the number of quarter years
5/3 = 1.015^n
log bo... | 4 | [
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0.0294189453125,
-0.06591796875... | 2,508 | 2508 | |
properties of exponents to simplify expressions. help needed.
June 29th 2008, 09:15 AM #1
Newbie
Joined
Jun 2008
Posts
24
properties of exponents to simplify expressions. help needed.
hello there. so i took precalculus in 10th grade, like 3 years ago, and now it's coming back to haunt me on my math place... | 4 | [
-0.00836181640625,
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0.10888671875,
0.076171875,
0.08056640625,
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0.06030273... | 2,509 | 2509 | |
Harmonic Digression
Iβve been meaning to submit this to the Proofs Without Words column ever since I discovered it way back when I was learning calculus. At the time, I wasnβt very impressed by showing that the harmonic
series diverged using integral approximations for some reason. I wish I could remember why β it wou... | 4 | [
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-0.064453125,
0.006744384765625,
0.0... | 2,510 | 2510 | |
Differential Equation Problem
January 23rd 2007, 12:24 AM #1
Newbie
Joined
Jan 2007
Posts
24
Differential Equation Problem
I have been struggling with this problem for a while:
A bullet passes through a piece of wood 0.1 m thick. It enters the wood at 400 m/s and leaves at 180 m/s. The velocity v of... | 5 | [
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0.038818359375,
0.0932... | 2,511 | 2511 | |
Help w/ Proof in Category Theory
January 6th 2009, 05:00 PM
mingcai6172
Help w/ Proof in Category Theory
I don't understand this proof, specifically the part in red, I don't understand. Please help me understand this step in the proof. Thanks!
Let Tors be the category whose objects are torsion abelian
g... | 4 | [
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0.019775390625,
0.1328125,
-0.02197265625,
0.057373046... | 2,512 | 2512 | |
prove subgroup of GL2(R)
September 6th 2011, 05:17 PM #1
Newbie
Joined
Jul 2011
Posts
21
prove subgroup of GL2(R)
Hi, I think I have this correct but I need someone to confirm my working.
Let G be the set of matrices of the form:
[a b]
[0 1]
for $a,b \in \mathbb{R}$
Prove that G is a... | 5 | [
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-0.0186767578125,
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0.03369140625,
0.008056640625,
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-0.07275390625,
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0.0022430419921875,
0.0034332275390625,
0.04248046875,
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0.0021514892578125,
0.049560546875,
-0.0048522949218... | 2,513 | 2513 | |
Can anyone solve this?
April 27th 2005, 01:44 AM
Chuck_3000
Can anyone solve this?
:confused: I need help with this maths question and no one can help me!!!
The set {1,2,3,4} can be partitioned into two subsets {1,4} and {2,3} of the same size. Notice that 1+4 = 2+3
a)Find the next whole number n, abov... | 4 | [
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0.046142578125,
0.006011962890625,
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0.0301513671875,
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-0.0091552734375,
0.046875,
-0.045410156... | 2,514 | 2514 | |
Re: st: Interpretation of regressionmodel of ln-transformed variable
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Re: st: Interpretation of regressionmodel of ln-transformed variable
From "roland andersson" <rolandersson@gmail.com>
To statalist@hsphsun2.harvard.edu
Subject Re: st... | 5 | [
0.018310546875,
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A density on the natural numbers invariant with respect to the multiplication
up vote 8 down vote favorite
1
The "classical Beurling density" of a subset of the natural numbers is $d(A)=lim_{n\rightarrow\infty}\frac{|A\cap[1,n]|}{n}$, when it exists. It defines a finitely additive probability measure on the
natural nu... | 4 | [
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0.09130859375,
0... | 2,516 | 2516 | |
Legendre Symbol
May 11th 2009, 01:44 PM #1
Junior Member
Joined
May 2009
Posts
25
Legendre Symbol
Question:
If p is an odd prime and gcd (ab, p)=1, prove that at least one of a, b, or ab is a quadratic residue of p.
Prove it by contradiction, assume none of them were a quadratic residue, then $<... | 4 | [
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0.04931640625,
-0.00460815429... | 2,517 | 2517 | |
Conditional expectation of a PMF
November 6th 2009, 08:09 AM #1
Newbie
Joined
Sep 2009
Posts
11
Conditional expectation of a PMF
I'm having trouble starting this problem.
Say you committed a crime and you're sentenced to jail. When entering the jail, you pick one ball from a box containing 3 balls, ... | 4 | [
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-0.0610351562... | 2,518 | 2518 | |
Integral using Partial Fractions with Square Roots
April 30th 2010, 11:12 AM #1
Newbie
Joined
Apr 2010
Posts
4
Integral using Partial Fractions with Square Roots
New to the forums (Obviously)
I'm having slight trouble with a problem relating to the volume of a rotating region R, but I only need help... | 5 | [
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0.058349609375,
0.0283203125... | 2,519 | 2519 | |
Fun probability question
September 30th 2009, 02:38 PM
vexiked
Fun probability question
A bowl contains w white balls and b black balls. One ball is selected at random from the bowl, its color noted, and is returned to the bowl along with n additonal balls of the same color. Another
ball is randomly selected... | 5 | [
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Linear Algebra by Chowchinchuen
ο©4 2 1 0οΉ οͺ ο4 ο6 1 3 οΊ οΊ. 1. Let A ο½ οͺ οͺ 8 16 ο3 ο4 οΊ οͺ οΊ ο« 20 10 4 ο3ο»
(a) Find an LU-factorization of A i.e. use row operations to find U, an upper triangular matrix equivalent to A and L, a lower triangular matrix such that A ο½ LU . (b) Find the determinant of A. ο© 3
1 3οΉ ο© ο1οΉ οͺ 4 ... | 4 | [
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-0... | 2,521 | 2521 | |
st: SV: RE: risk ratio
Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
st: SV: RE: risk ratio... | 5 | [
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0.00482177734375,
-0.0581054... | 2,522 | 2522 | |
Primitive root - proof
May 31st 2012, 03:23 AM #1
Member
Joined
Sep 2010
Posts
149
Thanks
3
Primitive root - proof
If m is a primitive root mod n, prove that { $m,m^2,m^3,.......,m^\phi^(^n^)$}
runs through all numbers nod n that are relatively prime to n.
I assume it has something to do wit... | 5 | [
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0.01171875,
... | 2,523 | 2523 | |
Trouble with difference quotient.
September 6th 2010, 04:16 PM #1
Newbie
Joined
Jul 2010
Posts
17
Trouble with difference quotient.
Can anyone demonstrate the difference quotient f(x) = -6/sqrt(3-4x)
I have worked on that problem for an hour.. tried a few different things.. and I'm flat out lost...
... | 4 | [
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0.056396484375,
-0.03271484... | 2,524 | 2524 | |
need help for basic trigo question
June 19th 2010, 12:04 AM #1
Newbie
Joined
May 2010
Posts
13
need help for basic trigo question
hi emm i am a begginer new to trigo just learnt it and i need help on this question.
i have included a basic diagram drawn by me.(sry if the diagram is not very nice)
... | 4 | [
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-0.05859375,
-0.00234985... | 2,525 | 2525 | |
No integer Solutions
July 14th 2011, 02:51 AM #1
Newbie
Joined
Jul 2011
Posts
5
Prove that 15x^2 -7y^2=9 has no integer solutions.
I have understood a few steps
15x^2 -7y^2=9 => y=3y1 => 5x^2-21y^2=3 => x-3x1 => 15x1^2-7y1^2=1 =>y1^2=2 mod 3
But this contradiction how???
If there is any... | 5 | [
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-0.0344... | 2,526 | 2526 | |
Quadratic function:convert to standard form?
September 1st 2012, 12:03 PM #1
Newbie
Joined
Sep 2012
From
Canada
Posts
1
Quadratic function:convert to standard form?
Hi guys, i need help with these questions, i have attempted the questions myself and just wanted to double check my answers.
convert... | 4 | [
-0.0184326171875,
-0.040283203125,
0.00384521484375,
-0.052978515625,
-0.05859375,
0.072265625,
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-0.03076171875,
-0.0025787353515625,
0.0230712890625,
0.062255859375,
-0.0517578125,
0.00958251953125,
0.0147705078125,
0.035400390625,
0.09423828125,
-0.006195068359375,
... | 2,527 | 2527 | |
VB:Tutorials:Rotating A Point In 2D
From GPWiki
This tutorial will discuss rotating a point around a point using Sin/Cos.
The Math
Sine and CoSine
What are Sine and Cosine? Sine and Cosine are our little buddies. They like to deal with angles. How do we rotate something with them? First we need a way to store poin... | 4 | [
-0.0791015625,
-0.004547119140625,
-0.10791015625,
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0.0084228515625,
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0.048583984375,
0.042236328125,
-0.0027618408203125,
0.07958984375,
0.04443359375,
0.013671875,
0.0208740234375,
0.052734375,
0.030517578125,
-0.1123046875,
0.0834960... | 2,528 | 2528 | |
Summary: Piercing d-intervals
Noga Alon
Abstract
A (homogeneous) d-interval is a union of d closed intervals in the line. Using topological meth-
ods, Tardos and Kaiser proved that for any finite collection of d-intervals that contains no k + 1
pairwise disjoint members, there is a set of O(d2
k) points that intersects... | 5 | [
-0.05419921875,
0.052001953125,
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0.0299072265625,
-0.041259765625,
-0.01043701171875,
0.00145721435546875,
0.0054016113281... | 2,529 | 2529 | |
*** Discrete Math ***
Posted by Jane on Friday, November 23, 2007 at 3:32pm.
I have solved parts of the question, but I want to know if they are correct. Other parts I'm not sure how to do, like part b and c.
g(x)=2x+1
Define g^3= g^2 o g,...,g^n =g^(n-1) o g
(where "o" means composition)
a) Give rules for g^2, g^... | 4 | [
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0.0062255859375,
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0.05078125,
-0.005218505859375,
0.0441894531... | 2,530 | 2530 | |
Trignometric Functions
May 13th 2007, 03:43 PM #1
Junior Member
Joined
Mar 2007
Posts
32
Can somebody help me with these?
1. Simplify the expression sinx (cscx - sin x)
2. rewrite the expression cos^2 / (1 + sin x) so that there is no fraction
3. use the half-angle formula to simplify the exp... | 4 | [
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0.048828125,
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0.037353515625,
0.0172119140625,
-0.042236328125,
0.0224609375,
0.026611328... | 2,531 | 2531 | |
Math Help
January 17th 2009, 09:25 AM #1
Member
Joined
Dec 2008
Posts
86
strings
Hello i need help with this problem:
1-How many strings of length 10 over the alphabet
{a, b, c} have exactly
3 aβs or exactly 4 bβs ?
2-There are 12 signs in the zodiac. How many people are ... | 4 | [
0.0498046875,
-0.0084228515625,
0.037109375,
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0.00897216796875,
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0.041748046875,
-0.059814453125,
-0.058837890625,
... | 2,532 | 2532 | |
MathGroup Archive: September 2011 [00256]
[Date Index] [Thread Index] [Author Index]
Re: Solve::nsmet
β’ To: mathgroup at smc.vnet.net
β’ Subject: [mg121411] Re: Solve::nsmet
β’ From: Bill Rowe <readnews at sbcglobal.net>
β’ Date: Wed, ... | 5 | [
-0.11279296875,
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0.03466796875,
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0.06884765625,
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0.04443359375,
0.039794921875,
0.02783203125,
-0.07177734375,
-0.0... | 2,533 | 2533 | |
Homework Help
Posted by Arielt on Sunday, March 14, 2010 at 1:25pm.
Suppose that a polynomial function of degree 4 with rational coefficients has i and (-3 + square root of 3)as zeros find the other zeros
β’ Precalculus - drwls, Sunday, March 14, 2010 at 3:13pm
There must be four roots total and complex numbers... | 4 | [
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0.080078125,
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0.0135498046875,
-0.078125,
-0.02404785156... | 2,534 | 2534 | |
Integration Help (Read more for more info)
December 5th 2012, 01:29 AM
Danthemaths
Integration Help (Read more for more info)
Hey guys,
I am a bit stuck answering this question. The question being:
If dy/dx = (x+3)(x-2), Find y
I expanded the brackets first of all but a bit stuck from here. Can anyo... | 4 | [
-0.10400390625,
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0.0274658203125,
-0.026611328125,
-0... | 2,535 | 2535 | |
Partial Fraction Integral - Trig with Substitution
September 6th 2011, 09:18 PM #1
Member
Joined
Jan 2011
Posts
156
Partial Fraction Integral - Trig with Substitution
$\displaystyle \int \frac{\cos x dx}{6 \sin^2 x + \sin x}$
$let u = \sin x; du = \cos x dx$
$\int \frac{du}{6u^2 + u}$
$\fr... | 5 | [
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-0.006195... | 2,536 | 2536 | |
graphing logarithmic equation
$lo{g_n}({(mn)^{x - {{\log }_m}n}}) = {\log _n}(\frac{{{{(mn)}^x}}}{{{{(mn)}^{{{\log }_m}n}}}}) = {\log _n}(\frac{{{m^x}{n^x}}}{{{m^{{{\log }_m}n}} \times {n^{{{\log }_m}n}}}}) = <br />$ $= {\log _n}
(\frac{{{m^x}{n^x}}}{{n \times {n^{{{\log }_m}n}}}}) = {\log _n}({n^{x - 1}}) + {\log _n}(... | 4 | [
-0.0289306640625,
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0.061279296875,
0.034423828125,
-0.01141357421875,
0.01... | 2,537 | 2537 | |
optimatization problem
February 9th 2009, 09:35 PM #1
Junior Member
Joined
Feb 2009
Posts
41
Hi! can someome help me with this exercise
An open top box with a rectagular base is to be constructed. The box is to be at least 2 inches wide and twice as long as it is wide and is to have a volume of 150 c... | 4 | [
0.07861328125,
0.054443359375,
0.0155029296875,
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0.07763671875,
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0.07275390625,
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0.0228271484375,
0.0654296875,
-0.059814453125,
0.0133056640625,
-0.03955078125,
0.0177... | 2,538 | 2538 | |
Homework Help
Posted by Andrea on Thursday, January 14, 2010 at 11:41am.
a person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of 18 ms. The cliff is 52m above the waters surface. How long does it take for the stone to fall to the
water? With what speed does it strike the water?
... | 4 | [
0.0272216796875,
0.0869140625,
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0.006072998046875,
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0.01806640625,
-0.031982421875,
0.043701171875,
-0.0003681182861328125,
... | 2,539 | 2539 | |
Separable Equations
A differential equation is separable if it can be written with one variable only on the left and the other variable only on the right:
... | 5 | [
-0.0703125,
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0.043701171875,
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0.09619140625,
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0.05859375,
0.051513671875,
-0.03564453125,
-0.046630859375,
0.056884765... | 2,540 | 2540 | |
Math (linear approximation)
Posted by Alison on Tuesday, November 29, 2011 at 4:06pm.
Find a linear approximation of the function f(x)=(1+x)^(1/4) at a=1, and use it to approximate the numbers (.95)^(1/4) and (1.1)^(1/4).
Round your answers to the nearest thousandth
Cheers in advance!
β’ Math (linear approximation... | 5 | [
0.04052734375,
-0.0390625,
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0.0771484375,
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0.05029296875,
0.0625,
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0.05126953125,
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0.06640625,
-0.02099609375,
-0.0306396484375,
-0.0... | 2,541 | 2541 | |
Cartesian Coordinates Lesson Plans & Worksheets | Lesson Planet
Cartesian Coordinates Teacher Resources
Find Cartesian Coordinates educational ideas and activities
Showing 1 - 20 of 207 resources
Students use Cartesian coordinates or degrees of latitude and longitude to locate important locations within their specif... | 4 | [
0.060546875,
0.0218505859375,
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0.0859375,
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0.0284423828125,
0.1044921875,
-0.02392578125,
-0.03369140625,
-0.0595703125,
0.04443359375,
0.0375... | 2,542 | 2542 | |
Tables for epidemiologists
β’ 2 Γ 2 and 2 Γ 2 stratified table for longitudinal, cohort study, caseβcontrol, and matched caseβcontrol β’ Choice of weights for stratified tables: MantelβHaenszel, standardized, or user
data ... | 5 | [
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-0.033935546875,
0.0264892578125... | 2,543 | 2543 | |
Solve the Differential Equation
March 19th 2009, 05:01 AM #1
Newbie
Joined
Sep 2008
Posts
9
Solve the Differential Equation
I have been having some trouble with the following question - i'm not sure how the substitution works and how to change back at the end.
Any help greatly appreciated!
Show... | 5 | [
-0.1142578125,
0.07763671875,
0.08447265625,
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0.050048828125,
0.0576171875,
-0.087890625,
-0.014404296875,
0.02368164062... | 2,544 | 2544 | |
help with integrating fractions with e in them
January 21st 2009, 07:23 PM #1
Newbie
Joined
Jan 2009
Posts
2
help with integrating fractions with e in them
Hey everyone, first post ever in here. This is my 2nd time taking Calculus 2 and I feel like I am worse off than the first time.
I have a quick ... | 5 | [
0.04052734375,
-0.021484375,
0.06787109375,
-0.078125,
0.0419921875,
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0.0311279296875,
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0.051025390625,
0.02734375,
-0.0303955078125,
0.031494140625,
0.031982421875,
... | 2,545 | 2545 | |
On the numerical solution of simultaneous, non-linear equations in computer-aided preliminary design
Abstract:
In the solution of problems in preliminary design, it often becomes necessary to solve systems of equations. An immediate example from aeronautical design is the frequent need to perform several
iterations ar... | 4 | [
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-0.031494140625,
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0.0103759765625,
-0.0177001953125,
-0.00646972... | 2,546 | 2546 | |
Homework Help
Posted by nat on Monday, February 4, 2008 at 2:33am.
Two capacitors, C1=25.0x10^-6 and C2=5.0x10^-6 are connected in parallel and charged with a 100-V power supply.
a)calculate the total energy stored in the 2 capacitors
b) what potential difference would be required across the same 2 capacitors connec... | 4 | [
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0.0162353515625,
-0.09033203... | 2,547 | 2547 | |
vexingly simple proof (sum periodic functns)
October 31st 2009, 09:26 AM #1
Junior Member
Joined
Oct 2009
Posts
39
vexingly simple proof (sum periodic functns)
I have a feeling this proof is supposed to be more complex, is this legitimate?
Let f(x) and g(x) be continuous, periodic functions defined f... | 5 | [
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0.0218505859375,
-0.06884765625,
0.0267333984375,
0.0... | 2,548 | 2548 | |
Homework Help
Posted by sam on Monday, May 19, 2008 at 3:00am.
oil is leaking from a pipeline on the surface of a lake and forms an oil slick whose volume increases at a constant rate of 2000 cubic centimeters per minute. The oil slick takes the form of a right
circular cylinder with both its radius r and height chang... | 5 | [
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0.03369140625,
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0.0244140625,
-0.0303955078125,
-0.0019149780273... | 2,549 | 2549 | |
Posts by
Total # Posts: 106
Calculus (Definite Integrals - Force) Please Help
A cylindrical oil storage tank 12 feet in diameter and 17feet long is lying on its side. Suppose the tank is half full of oil weighing 85 lb per cubic foot. What's the total force on one endof the
tank?
CALCULUS
A cylindrical oil storage t... | 5 | [
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0.0947265625,
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0.07470703125,
-0.07861328125,
0.005096435546875,
-0.004638671875,
-0.... | 2,550 | 2550 | |
Differential Equation
October 28th 2008, 08:20 AM #1
Member
Joined
Oct 2008
Posts
87
Differential Equation
A tank contains
Find the amount of salt in the tank after
I got something like 36 kg and my equation was
A= (320e^(-8t/1000)-320)/-8
but i dont think this is correct
Let C b... | 5 | [
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0.0859375,
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0.056396484375,
-0.060546875,
0.01611328125,
-0.04443359375,
0.01806640625,
... | 2,551 | 2551 | |
Check out my new math proof
September 19th 2012, 08:52 AM #1
Newbie
Joined
Sep 2012
From
Iowa City
Posts
5
Check out my new math proof
Greetings. This is my first post and I would like to share a proof that I recently put on youtube. It hasn't gotten many views yet so I figured I'd share it here .
... | 4 | [
-0.05517578125,
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0.06298828125,
0.005279541015625,
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0.05810546875,
0.03564453125,
0.... | 2,552 | 2552 | |
Limit of an integral
Show that $\lim_{n \to \infty} \int_0^1 \frac{x^2e^{x^n}}{1+x^3} dx=\frac{1}{3} \ln 2$
Hi problem, We can get at the exercise using the Lebesgue Dominated Convergence Theorem. Let $f_{n}=\frac{x^{2}e^{x^{n}}}{1+x^{3}},$ and note that $f_{n}\geq 0$ for all $n$ so that $|f_{n}|=f_{n}$
for all $n.$ 1... | 5 | [
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0.048828125,
-0.0155029296875,
-0.05810546875,
-0.0673828125,
-0.002349853515625,
-0.0... | 2,553 | 2553 | |
[SOLVED] Solving Trigonometric equations
March 24th 2009, 10:36 AM #1
Member
Joined
Jan 2009
Posts
197
[SOLVED] Solving Trigonometric equations
Find the solution of the following equations if $0 \leq t \leq 2\pi$
$sec^2-2tant=0$
Attempt:
$(tant-2.3)(tant+0.4)$
Am I in the right track?
... | 4 | [
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0.0302734375,
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0.0634765625,
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0.058837890625,
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0.07568359375,
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0.050537109375,
0.004669189453125,
-0.0301513671875,
0.0250244140625,
-0.045410156... | 2,554 | 2554 | |
Dynamic modeling of turbine blade with friction damper and study of the resonant response of blade.
Link/Page Citation
1. INTRODUCTION
Service failure of gas turbine blades in many instances can be attributed to high c... | 4 | [
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... | 2,555 | 2555 | |
Homework Help
Posted by Peter on Saturday, August 11, 2012 at 3:27pm.
How do I find the minimum or maximum of this y = 2xΒ³ + 3xΒ² - 12x? It makes 2 curves.
β’ Pre-Calculus - Steve, Saturday, August 11, 2012 at 5:00pm
y = 2x^3 + 3x^2 - 12x
y' = 6x^2 + 6x - 12 = 6(x+2)(x-1)
y'=0 when x=-2 or 1
Knowing... | 4 | [
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-0.020751953125,
... | 2,556 | 2556 | |
Math Forum Discussions
Re: RMP # 48
Posted: Oct 7, 2007 6:15 PM
Franz,
Your translation of RMP 33 looks more like a transliteration, a method used by linguists, rather than a math problem, written by mathematicians. To a mathematician Egyptian algebra involves working
Ahmes' algebra problems and translating Ahmes' wo... | 5 | [
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... | 2,557 | 2557 | |
The Old techInterview Forum - Answer to "Pennies" Riddle Flawed.
Answer to "Pennies" Riddle Flawed.
A slight flaw in the answer to this riddle.
HHH O
HHT OX
HTH X
HTT X
THH O
THT X
TTH
TTT
O wins if H, then H
X wins if H, then T
Therefore, O wins 3/8 of the time, and X wins 4/8 of the time, right.....? Nope!... | 5 | [
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Problem with integration by parts
February 4th 2013, 10:24 PM #1
Newbie
Joined
Nov 2012
From
PA
Posts
21
Thanks
1
Problem with integration by parts
Hey guys/gals,
I have a problem involving integration by parts that has me stumped. Here is the equation:
$\int {xln(4+x^2)}dx$
Proble... | 5 | [
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0.06982421875,
0.01263427734... | 2,559 | 2559 | |
Homework Help
Posted by sally on Wednesday, August 31, 2005 at 12:07am.
need help math I have a big square of 9little squares in it on the first row going down I got 1 4 6 that makes 11 ok I have to make 11 using those number on the other squares and I can not double the
same number in every way it has to come out 11 ... | 5 | [
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0.... | 2,560 | 2560 | |
mean value theorem
October 11th 2009, 10:14 AM
friday616
mean value theorem
Use the Mean Value Theorem to prove that sqrt(1+x) < 1 + x/2 for all x > 0. Generalize this result to the function (1+x)^r, where r < 1 is a positive rational number.
Thanks!
October 11th 2009, 10:40 AM
redsoxfan325
Quote:
... | 5 | [
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Schmidt camera
telescopeΡ²ptics.net βͺ βͺ βͺ βͺ βͺβͺβͺβͺ βͺ βͺ βͺ βͺ βͺ βͺ βͺ βͺ βͺ CONTENTS
β 10.2.1.3. Honders camera β 10.2.2.1. Schmidt camera: aberrations βΊ
10.2.2. Full-aperture Schmidt correct... | 4 | [
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0.029052734375,
0... | 2,562 | 2562 | |
solving for t
November 25th 2012, 02:46 PM #1
Newbie
Joined
Oct 2012
From
United States
Posts
14
solving for t (daylight hours problem)?
i'm trying to solve the following problem for t: 720 = 11.895 + 2.545 sin [(2pi/366)(t-80)]. my formula is using the format y = d + a cos [b(t-c)]
I found a s... | 4 | [
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0.005035400390625... | 2,563 | 2563 | |
Simple beginners probability question
January 15th 2011, 01:38 PM #1
Newbie
Joined
Mar 2010
Posts
9
Simple beginners probability question
Hi, could you check over my work to see if this is correct?
You are given $P(A \cup B)=0.7$ and $P(A \cup B\prime)=0.9$. Determine P(A).
Find B:
$P(A \cu... | 4 | [
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... | 2,564 | 2564 | |
T
How to how to create a table of function values. (And introduction to functions)
This topic is part of the TCS FREE high school mathematics 'How-to Library'. It introduces the concept of a function, and shows you how to create a table of function values.
(... | 4 | [
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... | 2,565 | 2565 | |
MINIMIZATION PROBLEM (CALC)
Posted by Pierre on Saturday, October 30, 2010 at 3:55pm.
A wire 9 meters long is cut into two pieces. One piece is bent into a square for a frame for a stained glass ornament, while the other piece is bent into a circle for a TV antenna. To reduce storage
space, where should the wire be cu... | 4 | [
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0.119140625,
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... | 2,566 | 2566 | |
Homework Help
Posted by Help asap!! plz on Thursday, October 7, 2010 at 3:53pm.
Hi,
I am lost on couple of problems and i was wondering if you could just help me out with them.
1. Find and classify the points of discontinuity of the function F(x) = (x^2+7x+12)/(x^3-9x)
now for this problem i know there is going to ... | 4 | [
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-0.0571... | 2,567 | 2567 | |
Math Help
January 7th 2007, 03:22 PM #1
Newbie
Joined
Jan 2007
Posts
13
concavity
The graph of the function y=x^3 + 6x^2 + 7x - 2cosx changes concavity at x=....?
We're supposed to use a calculator and the answer is -1.89 but how do you find that?
Find the 2nd derivative, set to 0 and solve fo... | 5 | [
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-0.009155273437... | 2,568 | 2568 | |
Isomorphism of Direct product of groups
April 15th 2013, 11:22 AM #1
Member
Joined
Jul 2009
Posts
111
Thanks
1
find which of the following groups is isomorphic to S[3] $\bigoplus$ Z[2].
a) Z[12] b) A[4] c) D[6] d) Z[6] $\bigoplus$ Z[2]
I eliminate option a because Z12 is cyclic whereas S[3] ... | 4 | [
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0.060302734375,... | 2,569 | 2569 | |
Pre-AP Algebra 2 Unit 4 Practice and Review
β’ 1. Solve for x please: (((0.07x^2/3)^3)^-4) + 11 = 21 (express answer to 2 decimal places)
β’ 2. Determine the locator point of y = 5(x + 11)^2 - 30 (express your answer as a data poin... | 4 | [
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-0.043212... | 2,570 | 2570 | |
Examples of Recursion
Problem : Write a function to recursively print out an integer in any base from base 2 to base 9.
void print_base(int num, int base)
{
if (num / base) print_base(num / base, base);
putchar(num % base + '0');
}
Problem : Write a recursive function int count_dig... | 5 | [
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0.08203125,
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-0.0693359375,
0.03063... | 2,571 | 2571 | |
Help with Polynomials and Radicals
November 29th 2012, 03:15 PM #1
Newbie
Joined
Nov 2012
From
California
Posts
3
Help with Polynomials and Radicals
I am confused about the following problem, and cannot figure out how to solve it without using a graphing calculator.
Sqrt(x+5) - Sqrt(2x+3) = -2
... | 4 | [
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0.0576171875,
-0.030517578125,
-0.... | 2,572 | 2572 | |
could some check solution please
February 17th 2010, 03:18 PM #1
could some check solution please
Given the function
$y= \frac{x+1}{x}$
a. Find the equation of the tangent to the curve at the point (2,(3/2))
b. Find the value of x where the tangent to the curve is
perpendicular to the tangent f... | 4 | [
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-0.039550781... | 2,573 | 2573 | |
Question on power series coefficient of bounded function
March 28th 2013, 03:16 AM
director
Question on power series coefficient of bounded function
I have a function f holomorphic on D(0;R).
s, r such that (r < s < R)
M(r) = sup { |f(z)| : z = r } (r < R)
M(s) = sup { |f(z)| : z = s } (s < R)
... | 4 | [
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0.04736328125,
-0.0358886... | 2,574 | 2574 | |
Maximum Difference, Longitude and Latitude
Date: 04/10/2001 at 00:32:40
From: Mini Thomas
Subject: Maximum longitude and latitude difference between two points
separated by a given distance
I want to find the maximum longitude difference and maximum latitude
difference between two points A and B on Earth that are se... | 5 | [
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0.10107421875,
0.0252685546875,
0.010131835... | 2,575 | 2575 | |
Homework Help
Posted by Ruth on Saturday, August 12, 2006 at 4:55am.
Determine the volume of the solid abtained when the region bounded by y=sqrt x and the line Y=2 and x=0 is rotated:
(i) about the x-axis
(ii) about the line x=4.
(i) Each element of the body of revolution with thickness dx, has area
pi*(sqrt x)^2... | 5 | [
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centrality
Created by Motoki Watabe. 1998 All Rights Reserved.
Exercise for Chapter 6: C... | 5 | [
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-0.06201171875,
-0.0... | 2,577 | 2577 | |
Trig word problem help
November 18th 2008, 02:34 AM #1
Newbie
Joined
Nov 2008
Posts
16
Trig word problem help
The shadow of a city building is observed to be 100 m long. At the same time the shadow of a lamp post 9 m high is observed to be 5.5 m long. Find the altitude of the sun, and the height of the
... | 4 | [
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0.0703125,
-0.028076171875,
0.0485839843... | 2,578 | 2578 | |
Problem 47
March 1st 2008, 05:13 PM #1
Global Moderator
Joined
Nov 2005
From
New York City
Posts
10,616
Thanks
9
Problem 47
1a)Let $n$ be an odd positive integer. Let $\zeta = e^{2\pi i/n}$ prove that $x^n - y^n = \prod_{k=0}^{(n-1)} (x\zeta^k - y\zeta^{-k})$.
1b)Let $f(z) = 2i\sin (2\pi z)$ ... | 5 | [
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-0.051513671875,
-0.009765625,
... | 2,579 | 2579 | |
Fibonacci proof
December 26th 2007, 02:57 AM #1
Newbie
Joined
Dec 2007
Posts
8
Fibonacci proof
The numbers F0, F1, F2,... are defined as follows (this is a definition by mathematical induction, by the way): F0 = 0, F1 = 1, Fn+2 = Fn+1 + Fn for n = 0,1,2,....... Prove that for any n>=0 we
have Fn<=((1... | 4 | [
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0.09130859375,
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-0.0203857421875,
-0.07373046875,
-0.0402832... | 2,580 | 2580 | |
imple interest
Welcome to the Teachers' Choice Software web site.
Our FREE on line mathematics 'How-To' library is open 24 hours a day.
The ever-growing library now has 71 helpful topics, and every topic includes a free download!
For the 'How-to' library topic on simple interest, click here.
This topic is pa... | 4 | [
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0.0135498046875,
0.04248046875,
0.005584716796875,
0.0439453125,
-0.10009765625,
... | 2,581 | 2581 | |
Questions on conditional and unconditional means and variances
May 18th 2006, 07:50 AM
Nathan_84
Questions on conditional and unconditional means and variances
I have a couple of questions in which I require to find the unconditional means and unconditional variances given the conditional probabilty distribution... | 5 | [
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Homework Help
Posted by PLEASE HELP on Sunday, March 25, 2012 at 8:59pm.
The perimeter of a triangle is 52 centimeters. The longest is 2 centimeters less than the sum of the other 2 sides. Twice the shortest side is 13 centimeters less than the longest side. Find the
lengths of each side of the triangle. What are the ... | 4 | [
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Moment generating function
February 1st 2008, 09:50 AM #1
Moment generating function
Ok, let's use the brute approach. This is a continuation of my previuos post:
http://www.mathhelpforum.com/math-he...ble-check.html
which is meant to analytically calculate the moments of the following pdf (this is my pr... | 5 | [
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-0.... | 2,584 | 2584 | |
Measures, orthogonal polynomials, and continued fractions
Summary: Measures, orthogonal polynomials,
and continued fractions
Michael Anshelevich
November 7, 2008
MEASURES AND ORTHOGONAL POLYNOMIALS.
Β΅ a positive measure on R.
A linear functional Β΅[P] = P(x) dΒ΅(x),
Β΅ : R[x] R.
Positive:
Β΅[P(x)2] 0.... | 4 | [
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0.0286865234... | 2,585 | 2585 | |
Group of Units (Abelian)
April 30th 2008, 11:08 AM #1
Member
Joined
Mar 2008
Posts
99
Group of Units (Abelian)
I am in dire need of help! $U_n$ is an abelian group under multiplication mod $(n)$. If you need more information, please let me know.
1) Find an element of maximal order in $U_{884}$.
... | 5 | [
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Math Help
October 6th 2006, 10:43 PM #1
Newbie
Joined
Oct 2006
Posts
15
geometry
i have some questions help
1.The formula for the area of a circle and the formula for the circumference of a circle.Write a formula for the area of a circle in terms of its circumference.
2. The formula for the hei... | 4 | [
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0.01623535156... | 2,587 | 2587 | |
Probabilty Question
November 7th 2008, 04:51 AM #1
Newbie
Joined
Nov 2008
Posts
4
Probabilty Question
p=80% (chance of winning a game)
n=5 (number of games)
What is the probability that you will win at least 4 games (find the probability that x is greater than or equal to 4).
Hello, JohhnyS... | 4 | [
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Christina
Total # Posts: 839
physics
Two mirrors are placed at a 90Β° angle to each other. A light ray strikes one mirror 0.730 m from the intersection of the mirrors with an incident angle of 36.5Β°. The ray then travels a distance d
before reflecting from the second mirror. (a) What is the distance d?
general science... | 5 | [
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confused while trying to factor this
October 30th 2010, 02:55 PM #1
Junior Member
Joined
Sep 2010
Posts
60
confused while trying to factor this
y^3-y^2+3y-3 is what im factoring
the book says the answer is (y-1)(y^2+3)
i dont know how it gets there
heres what i try to do:
(y^3-y^2)+(3y... | 4 | [
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Systems of Linear and Quadratic Equations
A Linear Equation is an equation of a line.
A Quadratic Equation is the equation of a parabola
and has at least one variable squared (such as x^2)
And together they form a System
of a Linear ... | 4 | [
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Sparse linear algebra (
Find the least-squares solution to a large, sparse, linear system of equations.
The function solves Ax = b or min ||b - Ax||^2 or ``min ||Ax - b||^2 + d^2 ||x||^2.
The matrix A may be square or rectangular (over-determined or under-determined), and may have any rank.
1. Unsymm... | 4 | [
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scillation
Inertial Oscillations in a Rotating Parabolic Bowl
ββ―β―βββββββββββββββββββββββββββββββββββββββββββ
βββLegend for arrows: β
βββ β
βββ β’ paint on merry-go-round, of length A β
βββ β
βββ β’ paint on merry-... | 4 | [
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... | 2,593 | 2593 | |
Inclusive Probabilities
Associated Topics || Dr. Math Home || Search Dr. Math
Inclusive Probabilities
Date: 11/06/9... | 4 | [
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Chebyshev's inequality
If X is a non-negative random variable for which E(X) exists,show that for every t>0. $P[X\geq t] \leq\frac {E(X)}{t}$
$\frac{E(X)}{t}=\int_0^{\infty} \frac{x}{t}p(x)\; dx = \int_0^t\frac{x}{t}p(x)\; dx + \int_t^{\infty}\frac{x}{t}p(x)\; dx$ ......... $\ge \int_t^{\infty}\frac{x}{t}p(x)\; dx$ an... | 5 | [
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Posts from November 2011 on Hydrobates
There is evidence to suggest that oscillations in levels of calcium inside and outside cells are used as a signalling mechanism. A variety of mathematical models have been introduced to study this
phenomenon. Here I will discuss some aspects of the subject. A more general review c... | 4 | [
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Homework Help
Posted by unknown on Friday, October 28, 2011 at 10:50am.
Jan says if you double each of the dimensions of a rectangular box, it will take twice as much wrapping paper to wrap it. How do you respond?
β’ math - Jai, Friday, October 28, 2011 at 11:03am
the surface area of a rectangular solid is give... | 4 | [
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Surface area of cuboid
January 6th 2009, 02:07 AM
lemonz
Surface area of cuboid
4 days till exams and counting down - nerves shattered already!
here goes:
A closed cuboid with rectangular base of width xcm. Length of base is twice the width and the volumn is 1944cm^3. The surface area of the cuboid is S... | 5 | [
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Homework Help
Posted by Liz on Tuesday, May 7, 2013 at 5:34pm.
You have a ten question multiple choice test in your next class and you did not study at all. Each question has four choices and only one correct answer. You are going to guess on each question. What
is the probability that you score at least a 20% on the ... | 4 | [
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