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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.
T 10:08 AM dtms1 
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All math courses. PDFs, tutorials and web links.
Sep15-14 01:06 PM phion 
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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 39,288
How would you expand (x+y)^0.5 ?
Sep16-10 04:59 AM
1 1,686
what is the real boundary(or difference) between discrete&continous(as the title)? my major is physics and i find that...
Sep15-10 04:19 PM
3 814
The thing I don't understand is how does finding out the median help you drawing in the horizontal and vertical lines....
Sep15-10 12:46 PM
1 3,367
If tan x = cos x, then what is x ? The answer includes the golden ratio !
Sep15-10 08:17 AM
12 2,356
Hello, I know how to figure out the formula for 1 +2 + 3 + ... + n (i.e., (1+n)n/2 ). But what is the formula for...
Sep14-10 07:57 PM
11 3,589
I guess it has been too long since i have had to use any math beyond arithmetic. I am working on fabricating some tube...
Sep13-10 11:58 PM
7 4,231
There is an article on wikipedia (here) about Fourier division algorithm, but there is something that confuses me....
Sep13-10 05:42 PM
1 1,867
I know that a complex number can be written in form of a+bi and r(cos(theta) + isin(theta)) but I don't understand...
Sep13-10 04:47 PM
5 1,961
Hi, all: about HMM Evaluation question: There are 3 methods to carry out HMM evaluation. 1) forward algorithm...
Sep13-10 01:21 PM
0 1,386
Hi, I need to write a 4000 word math research paper and I'm looking for a topic. Some sample topics that were given...
Sep13-10 11:35 AM
3 4,368
The Earth's current Human population is 6 Billion. Some time in 1940 the world population was 3 billion and around...
Sep13-10 11:08 AM
18 7,782
ln(-1)/i=pi this equation does not use limits or integrals, as you can see, but it does involve imaginary numbers....
Sep13-10 09:09 AM
6 1,553
Problems in books that say "Show that" or "Derive this" does that qualify as a "Proof"? I spend most of my study time...
Sep13-10 09:05 AM
5 2,111
Hello, I'm trying to find the inverse polynomial of y = ax^2 + bx + c in the form of x = dy^2 + ey + f. I'm...
Sep13-10 03:30 AM
7 2,648
so I've been doing review and I got stuck on two questions, I was wondering if anyone could help me out. Any help...
Sep13-10 12:49 AM
3 3,968
I'm trying to figure out how to enter this into my calculator and get a graph, but I think it may be underpowered. ...
Sep12-10 11:36 PM
1 2,297
Hello yall im new here. Im a first year student in engineering. I'm writing up a lab now and im supposed to be...
Sep12-10 12:55 PM
2 1,180
The relation to be proved looks pretty simple. However, there is no evident point from whih I can start. How do I...
Sep12-10 06:13 AM
1 1,044
Hi all, I have this math problem where an equilateral triangle has each of its sides divided into ratio 2:1, and a...
Sep11-10 05:38 AM
21 10,910
Yesterday I thought of a math problem, and it seems very simple, as I assume the solution is, and I want to know the...
Sep11-10 01:24 AM
1 782
The polynomial is x^n + A1x^(n-1) + A2x^(n-2) + ... + A2x^2 + A1x + 1. Where An (integer) is not zero for all n and n...
Sep10-10 04:21 PM
2 1,275
A warm up problem 1 Somebody flips two coins on table, and then hides them with some two pieces of clothing. You...
Sep10-10 03:18 PM
14 3,854
could somebody better explain to me what these hat symbols mean when used with vectors.
Sep10-10 09:59 AM
1 6,441
Have you ever wondered the rationale behind mathematics conventions? Why multiplication is evaluated before...
Sep10-10 03:32 AM
7 2,464
Hi everyone. I'm new posting to these forums, although I have been lurking for the past couple of months. My...
Sep10-10 12:37 AM
1 1,607
I know that N (natural numbers) is the set of non-negative integers, 0, 1, 2, 3, 4...infinity, and that Z is the set...
Sep9-10 06:26 PM
7 4,373
Hi all I have a log-log graph as attached and would like to find the equations of the lines plotted on it. If I...
Sep9-10 03:43 PM
0 1,421
so I have 2^{1990}=(199k+2)^{10} expanding I have. 2^{1990}=2^{10}+10.2^9. (199k)+\frac{10.9}{1.2}...
Sep9-10 02:03 PM
dr hannibal
2 881
An Example Scenario: A particle moves at 32 and collides with a wall. This wall is rectangular in nature, which...
Sep9-10 03:38 AM
4 2,758
Hey i have a question: Q. One root of the cubic equation is z^3 + az + 10 = 0 is 1 + 2i. (i). Find the value of...
Sep8-10 05:30 PM
10 2,659
Hi, my algebra skills are a bit rusty so can someone tell me if I've rearranged this equation correctly. This is the...
Sep8-10 04:27 PM
1 718
Hi, how can I work out the relationship between percentages of a whole, when one of those percentages changes? I'm...
Sep8-10 10:19 AM
27 4,026
Suppose I wind up with the relation f(x)\delta (x-x')=g(x)\delta (x-x') true for all x'. Can I safely...
Sep8-10 09:51 AM
2 1,292
Sorry for the wordiness of the thread title. Basically I'm wondering, if you have two implicit functions, F(x,y)=0...
Sep8-10 08:51 AM
0 838
Hi I need to rearrange the following formula to get a(Acceleration): s = ut-1/2at The last t is squared ...
Sep7-10 11:47 AM
13 9,084
If it is said that a function has nondegenerate extrema does this simply mean that the extrema are isolated? (The...
Sep7-10 10:11 AM
4 2,243
Does dx/dv = t ? Can you just manipulate equations like this? Stu
Sep6-10 03:39 PM
6 986
I have found out what a matrice is, but i cannot think wat an example of it would be, ive been thinkning and about it,...
Sep6-10 02:03 AM
4 1,240
Hello, I have a three axis accelerometer that I am using in project that I am working on and I need to find the...
Sep5-10 09:22 PM
10 16,707
When do you become introduced to complex numbers? For example, raising functions to the power i or inputting i into...
Sep5-10 10:38 AM
8 1,783

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