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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.
Aug5-14 02:05 PM fredoniahead 
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All math courses. PDFs, tutorials and web links.
Y 03:38 AM Yashbhatt 
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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
micromass
1 38,988
is it Al = Ao(1/2)^(t/h) or Al = Ao(1/2)^(h/t) ? where Ao =original amount Al = amount left
Apr11-05 08:36 PM
dextercioby
1 20,311
Hi! Can anyone explain to me what this sign means. \equiv
Dec9-04 11:04 AM
dextercioby
15 20,275
How can you represent the largest # that is less than 1?
Apr27-11 09:47 AM
Hurkyl
97 20,198
have not seen this anywhere I've looked, anyone know?
Jun7-05 08:04 PM
vsage
1 20,198
Im just wandering what is the longest equation in mathematics?
Jun22-03 10:49 AM
einsteinian77
17 20,182
Good time people Is there any way other than dividing the number from 2 to its half to find all of its divisors?...
Feb11-09 02:14 PM
Shyan
9 20,072
I was looking around a little bit for an algorithm that would compute a complex number to the nth power. Can...
Jul17-08 05:49 AM
maze
7 20,042
I am a student who just finished high school and i am gonna go to college this fall. I got like 7 months to shape up...
Mar3-06 09:16 AM
Jeff Ford
22 19,993
I got this algebra problem that I have been trying to get around but the answer I get is always different from the...
Mar22-06 02:31 PM
sauri
9 19,915
What is the difference between these terms? In what context do they apply to? How important is it that we treat them...
Jul6-05 11:50 AM
mathwonk
4 19,821
This sequence cropped up in an IQ test. I can't for the life of me work out the next term, any ideas? 3, 8, 18,...
Jul22-10 05:12 AM
Dickfore
73 19,643
Hello, do anyone know a website where we can download for free 'equation editor' or any program to write math...
Apr17-07 08:00 AM
uart
25 19,614
Can anyone tell me how can I calculate the angle between two lines in 3D. I need in my codings. I know it has a...
Jul6-06 01:55 PM
somy
3 19,472
How does one do this, for example x= e^(-3t)u(t-4); how do you get x' ??
May6-03 09:38 AM
ahrkron
6 19,448
parallelogram properties 1.>Each diagonal divides it into two congruent triangles. 2.>Diagonals need not bisect...
Apr17-06 12:17 PM
arildno
4 19,427
This sounds like first grade mathematics but I need to know the reasoning. Why is it that to find a fraction of a...
Sep22-06 04:20 PM
mtanti
79 19,352
Hey guys, I was doing some questions from spivak when i noticed this integral he set up. To prove that the integral is...
Aug8-11 03:33 AM
dimension10
23 19,210
I was bored the other day and wondered whether or not it would be possible to find out the natural log of the...
Feb1-11 05:06 PM
HallsofIvy
20 18,986
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
TRUSKY1965
14 18,782
HII Friends Iam little bit new to matlab and iam trying to use ode45 and wrote code as function dy =...
Apr24-07 04:03 PM
AiRAVATA
2 18,765
How do i know under which circumstances to use synthetic and when to just do regular polynomial division? do they not...
Jun18-08 07:19 AM
jerckomilicic
6 18,761
Hi everyone Could you give me a way to calculate the period of every trigonometric functions? thanks
Apr8-09 02:42 PM
AUMathTutor
4 18,683
The other day I was playing with my calculator and noticed that \sqrt{2+\sqrt{2+\sqrt{2+\sqrt{2+...}}}} \approx 2 ...
Sep8-09 12:30 AM
Elucidus
6 18,668
Is it possible to obtain a sigma function or Taylor series function for the indefinite integral of a general Gaussian...
Nov5-13 04:48 PM
jackmell
23 18,566
the regular ellipse formula in 2D is x^2/a^2 + y^2/b^2 = 1. but how can it be transformed into a 3D formula including...
Sep10-08 09:32 PM
symbolipoint
10 18,525
edited..thanks for your help
Jan7-10 04:46 AM
davitz38
6 18,475
Can you get logarithms of imaginary numbers? The reason I was wondering is because integrating 1/(1+x^2) WRT x. I...
Apr28-13 06:43 PM
thelema418
11 18,455
This may be an elementary question, but I've been thinking about it a little bit and wondering what other people...
Jan20-13 07:43 PM
Vorde
41 18,444
This year I'm a freshman at university - physics - and we are just starting with mathematical analysis. I don't find...
Oct9-05 11:55 AM
robert Ihnot
7 18,325
I tried some formulas on my graph calculator after reading about root mean square calculations of power and physics....
Dec17-04 10:27 PM
Chrono
3 18,318
1. I am in intermediate Algebra and would like to take one more course to get prepared for Calculus 1. I am currently...
Mar12-10 09:10 AM
Angry Citizen
2 18,263
Some rule says that not all bounded sequence must be convergent sequence , one example is the sequence with general...
Jan17-06 10:56 AM
HallsofIvy
7 18,245
Hi! In a geometric progression you can find the sum to infinety is some series, for example 4,2,1,... where the...
Sep7-04 06:48 AM
HallsofIvy
3 18,211
Why is it that many mathematicians in the past who have made significantly profound contributions to the world of...
Nov5-11 05:32 PM
SteveL27
50 17,996
Hi All, I went to this website where someone wants to know how to calculate the area of some intersecting circles...
Aug27-04 09:40 PM
Jdo300
4 17,917
Hello, I have a simple equation (maybe simple for some) that I can't understand how to get from one point to the...
Apr24-04 12:55 AM
krab
7 17,855
I understand that the limit as x -> a for a polynomial function, f(x), is equal to f(a) because the function is always...
Sep29-05 10:49 AM
HallsofIvy
7 17,854
(Tanx)^2(Secx)
Dec7-08 05:53 AM
adriank
5 17,726
(x+y)^4=x^4+y^4 We know this is true if x and/or y = 0, but what other possibilities are there? I solved for...
Nov22-04 04:58 PM
JasonRox
4 17,624
Assume you have a med with a 72 hour half life, but that is dosed daily. How much elimination occurs each day of the...
Mar16-07 08:49 PM
Werg22
3 17,474

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