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Common math questions, quality answers.
Jul24-14 10:02 AM Greg Bernhardt 
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Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed. Brought to you by Office_Shredder.
T 06:41 AM jostpuur 
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:23 AM
1 37,990
I've been clawing at my mind for a while regarding this, I pray somebody can help me. I was implementing a method...
Aug11-10 10:04 AM
6 1,911
I hope this the right place to post my question... ...
Aug11-10 09:58 AM
2 1,444
How can the function f: ℝ → ℝ : (x,y) |--> {{x^3-y^3}\over{x-y}} if x ≠ y be defined on the line y=x so that we...
Aug11-10 08:43 AM
2 1,007
How can the function f: ℝ → ℝ : (x,y) |--> {{x^2+y^2-(x^3y^3)}\over{x^2+y^2}} if (x,y) ≠ (0,0) be defined in...
Aug11-10 08:10 AM
4 1,755
Hi, I'm modeling receptors moving along a cell surface that interact with proteins inside of a cell. I figured it...
Aug10-10 11:08 PM
2 2,030
Hey guys. We are using the chi squared test to determine if there is a significant difference in the observed data...
Aug10-10 09:06 PM
0 894
I am performing one experiment in which I have a system output as Q which fundamentally depends on 3 independent...
Aug10-10 02:48 PM
1 1,102
We all know BEDMAS from grade school: brackets, exponents, division, multiplication, addition, subtraction. My...
Aug9-10 09:07 AM
Petr Mugver
6 4,380
Does \lim_{n \rightarrow \infty} \sum^{n}_{i=1} 1/n Equal: one, zero, or something else?
Aug9-10 08:41 AM
32 4,896
I am a college physics grad. For many subtopics of precalculus or calculus, the following statement applies to me: ...
Aug8-10 10:52 PM
1 984
Hello; Can you identify a pattern in this sequence of numbers (a recurrence relation)? 1, 3, 5, 9, 13, 17, 25,...
Aug8-10 03:39 PM
2 2,575
Hello; This is not a homework question, but something I was wondering about solving difference equations. For...
Aug8-10 01:19 PM
7 5,195
Hi, I'm trying to get this working for a program I'm making. I've been working on this for a while, but I can't seem...
Aug8-10 05:06 AM
Petr Mugver
3 2,072
I just started reading the introductory section of Spivak's calculus, and it has an introduction about the main...
Aug7-10 04:10 PM
2 900
im just curious. is there a formula for the fibonacci formula in terms of..well terms. like the nth term =..? iv...
Aug7-10 02:55 AM
8 15,222
When calculating the angle between two vectors, I take the inverse cosine of the dot product of the two vectors...
Aug6-10 08:04 AM
Petr Mugver
3 2,543
Can someone show me why the derivative of k(x) = cot x Is k'(x) = -cosec^2 x And not
Aug6-10 04:52 AM
7 1,637
Hello all, this is my first post here. Got into a debate over when a deck of cards drawn without replacement is...
Aug6-10 03:26 AM
7 11,233
I am new to Calculus. I know that the rate of change in some thing is called it's derivative or we differentiate...
Aug5-10 04:01 PM
2 1,174
I've been working through the book The Story of i(sqrt of -1). It's kinda like a story with a lot of Math. The first 2...
Aug5-10 03:44 PM
3 1,187
Adults need 2.5" between Eyes, but this is too far for kids eyes. Adults = 2.5" = 52 Pixels difference = left eye 26...
Aug5-10 02:13 PM
4 1,996
I read through that 800 something page Dover book on differential equations, but I feel like I haven't had enough...
Aug5-10 11:09 AM
3 4,702
1) Is there any way to find integer solutions for a linear equation ax+by=c, with a,b,c known and without having an...
Aug5-10 08:59 AM
2 2,207
ok this seems like a predominantly maths problem but i need it for a little project of mine related to classical...
Aug5-10 05:59 AM
4 1,035
I am wondering if anyone can tell me how to get Mathematica to recognize the product of two variables so that I can do...
Aug4-10 09:00 PM
1 1,213
Hello guys. I'm trying to create a formula here, and I got stuck at this step, where I have to calculate the following...
Aug4-10 05:34 PM
9 1,447
Okay so this seems like a very simple problem to me but I can't figure it out so I definitely need some help. I'm not...
Aug4-10 05:08 PM
48 14,812
I'm going to guess that mine isn't the first "speeding ticket" question ever posted here, but I'm having a tough time...
Aug4-10 04:10 PM
2 1,563
Hello. Up until this point I have been solving this numerically, by propagating the state vectors and checking for a...
Aug4-10 02:34 PM
12 1,563
Everyone knows by now that a conic section is the figure formed when a plane intersects a right circular cone. Most...
Aug4-10 02:26 PM
4 1,462
This is going to be a weird question, but in textbooks when we're given the two spaces R^n and R^m, and they say...
Aug4-10 07:11 AM
4 1,457
Hello, I apologize in advance for the odd nature of this question. Can anyone recommend any renowned old (circa...
Aug3-10 05:03 PM
2 3,081
Being a 4th year mech. engineering student, you would think I could figure this out. But, for some reason, I can't...
Aug3-10 09:12 AM
2 2,018
I am doing a summer project where i have got lab data of fluxuating flow patterns in a flume, the data i have plots...
Aug3-10 04:36 AM
7 1,503
If we know that x + y = z, can we find out what xy = ? This is what I did. Say z = 5 x + y = z x + y = 5 y = 5...
Aug3-10 12:57 AM
4 1,049
So for a while i have been wondering if there was a way to find a point a certain distance along a linear function, so...
Aug3-10 12:21 AM
17 25,943
Hi For small angles or points near the vertex of a parabola we can approximate a parabolic surface with a circle....
Aug2-10 06:37 AM
1 1,822
Hi, I want to sum the following expression R(m)=sum(u(k)*u(m-k-1)) for k=0 to m-1 in matlab for each m-th ...
Aug2-10 04:13 AM
0 862
what's the general solution for x in the following equation x=c-N^{-\left(\frac{1+x}{1-x}\right)} i could...
Aug1-10 09:08 PM
6 1,424
Hi!, I'm well into the world of computer graphics. Love to say it was great but well, it isn't. I would like to...
Jul31-10 10:22 PM
1 765

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