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Common math questions, quality answers.
T 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.
Jul22-14 04:33 PM pasmith 
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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
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Hi! I've got a couple of questions about Sudoku. 1. How many possible Sudoku boards are there? That is, a 3x3...
Oct8-05 07:13 PM
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Hi! I was thinking about primes and have a bit of a question. I apologize if this is too easy or obvious -- I...
Mar25-07 04:47 PM
Moo Of Doom
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SO the entrance to a college is based off of two factors: 54% grade point average, and 46% supplemental application....
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Heres two problems from an A Level related paper: prove that if pq is irrational then atleast one of p or q is...
Oct17-11 04:20 AM
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I dont understand the concept (or need for) of vacuous truths/implications. Why is it that if say a statement a is...
Nov10-11 01:38 AM
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It seems to me (though I would be *extremely* glad to be proven wrong here) that in mathematics we often blindly...
May30-12 07:06 PM
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Hi, I was just reading up on some material for one of my exams and came across something. I realize this may seem...
Dec11-06 04:32 AM
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if given two points each with different x and y coordinates, what is the best way to define the error between these...
Jul12-07 01:24 PM
matt grime
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Why is it not possible to have the log of a negative number? Examples would be greatly appreciated. Furthermore,...
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Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in...
Jan28-11 10:13 AM
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Is the statement -1<1/0<1 decidable using the ordered field/real number axioms and first order logic? I have tried to...
Sep3-08 05:36 PM
ad infinitum
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I'm stumped as to how to find a formula for the number of pairs QN*QN between 1 and p-1. I must use the following as...
Apr28-03 01:18 AM
Ad Infinitum NAU
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You have 10 days of numbers that are averaged together (10 day avg). The most recent 3 days of numbers also averaged...
Aug5-08 05:20 PM
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Hello All, I need help making sure I am right about this. Say for example I have these two functions: f(n) = 2^n and...
Sep22-08 02:07 PM
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Can anyone give me examples of "infinity" in the physical world around us? Ie. evidence of its existence as more than...
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I first read this story in New Scientist when I was collecting it. Here are some highlights: The article has...
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Hi Folks. I was hoping to pick the brains of some of the mathematicians and mathematically inclined on this site. ...
Mar18-11 07:02 AM
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if i integrate d/dx(x^2), should i include the constant of integration? thanks
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this is quite a classic problem i think but im having difficulty finishing it off. If we have two stamps of positive...
Feb10-05 11:24 AM
robert Ihnot
4 1,190
does any one know a proof for the solution to the frobenius problem for n=2? that is, that the smallest not possible...
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hey, i was just wondering if anyone could help find the sum of the infinite series defined by 1/. I can split it into...
Nov2-09 03:10 PM
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if we know that an infinite series is convergent from an integer T, to infinity, then the series is convergent from 1...
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if you are given f(x,y)=x^2+y^2 and y=cos(t) x=sin(t), then when you differentiate f with respect to t, you use the...
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Suppose you are conducting a hypothesis test to compare two sample means from independent samples, with the variance...
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Hi everyone, I'm working with an online graphing program It's great, and actually tons of fun. I'm...
Apr3-14 09:00 PM
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I feel like a total noob, but my friend is reviewing distance formula and asked for my help. I can't seem to get the...
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Hi there, I have a question regarding this statement: My question is...
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Dear All, Currently I'm working out a formula for Destroyers in the online game BattleGround Europe to be able to...
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Dear All, After the great help I received last time I couldn't think of a better place to be asking this question....
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Hi, I'm looking for a recommendation for a good textbook which will deepen my understanding of...
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Hi, Just reading through a good physics book about games and came across some stuff on complex numbers. The book...
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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...
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I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 +...
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I have a test tomorrow and there are 2 question I am stuck on Five patrons check their coats at a theatre. In the...
Dec2-03 08:24 AM
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Im not sure if this is the right place, but I have an optimization problem where I assume we are supposed to use the...
Dec16-05 11:03 PM
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Hi, I have this double summation expression to solve as part of matlab code I am writing. I have searched matlab no...
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Hi, Please I need your assistance on this matlab code. I will really appreciate it. R=0.492; Pw=0.3708; for...
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Dear All, Please I need your assistance in solving this matlab problem. I will be glad to hear from you as early as...
May13-12 01:09 AM
Stephen Tashi
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Hi, Please assist, I write this matlab function and receive the error below function...
May16-12 07:03 AM
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Is it always possible to prove combinatorial identities in a brute force way, as opposed to the preferred way of...
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