
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:23 AM
micromass

1 
39,229 
Hi guys,
I am sort of new here. So I am not pretty sure if I am to post this question in here.
I am a software...

Mar2109 08:23 PM
mathman

5 
1,031 
Hi, well I need something close to curve fitting. But I am not sure if it could serve the purpose. The problem is as...

Mar1309 09:19 AM
Learner

2 
1,158 
I can't understand the different conditions given and from that equation of the circle is found.For example.
How...

Jul1007 11:08 PM
Werg22

7 
5,943 
Find the equation of the family of parabolas having fixed directrix.
Thanks for any help.

Sep308 08:34 AM
lizzie

0 
1,110 
What is it?!! I have tried plotting dummy data showing y values halving as x values double and no simple type of...

Jun2213 08:43 AM
Miffymycat

6 
890 
Hey,
Usually I have a general idea how to tackle a problem when posting on here.
This time I am pretty darn lost...

Aug2305 10:25 AM
HallsofIvy

5 
11,312 
1.Find the equation of the line joining A(1, 9) to B(6, 12).
Another line passes through C(7, 5) and meets AB at...

Oct1004 01:54 PM
omicron

2 
917 
T= ln x/k divided by (xk)
I need to rearrange this equation to solve for x.
This is not a homework assignment....

Jun613 03:04 PM
JJacquelin

5 
632 
so here's the question: if you have some equation relating a function, f(x), and its inverse, f1(x), can you solve...

Oct2612 04:32 PM
mathwonk

8 
1,128 
Hi,
Thanks for taking the time to look at my problem.
I'm following a worked example in a text book and I have...

Dec209 12:42 PM
SJB

2 
771 
Hi folks,
I have a differential equation which looks like
sin(f) + \frac{1}{Q}\frac{d(f)}{dt} + \frac{d^2(f)}{d...

Nov1110 03:15 PM
CompuChip

4 
743 
I have 4 difftiate equations now I want to solve them but i have no idea
dx/dt=ax+by
dy/dt=cy+dz
dz/dt=ez+fu...

Feb306 12:33 PM
SGT

6 
1,366 
Can anyone tell me how to solve....
400sinA + 500cosA = 600
Just doin some statics problems and for one of 'em I...

Apr1807 04:12 PM
Werg22

5 
1,532 
Can anyone help me rearrange this equation so that t is isolated please, it's driving me nuts.
x = tB + (1  t)A
...

Jul2709 08:01 AM
HallsofIvy

14 
936 
In the attached image, how are equations 1, 2, 3 and 4 used to come to the final equation of 5 and 6? Im suspecting it...

Jul1911 08:08 AM
exidez

12 
1,024 
I am making a game that has some sort of physics equations, although heavily modified to make it work better. I am...

Oct2213 12:02 AM
Pharrahnox

8 
731 
Hi,Few days I m trying to find out,what is difference between equation and function,but as I go deeper into it,I m...

Apr1513 06:32 PM
awecrump

3 
693 
I have (attached picture) 2 equations with the unknows u_k*, u_k, v_k, v_k*, where * denotes complex conjugate. Is it...

Mar1314 06:48 PM
aaaa202

0 
360 
hello everyone,
I usually post my questions on one small czech mathematical forum, but here is an equation noone...

Apr1608 10:30 AM
Roberto Bramb

4 
1,604 
For the standard equation z = z^2 + c, z diverges if the magnitude of z exceeds 2. I know there are also threshold...

Jan2105 08:00 PM
Moose352

0 
1,089 
Hi I hope someone can either help me directly and give me an overview of what needs to be done and also direct me to a...

Apr1313 06:22 PM
mikeph

8 
519 
Greetings PF,
I am would like to play with using an automated theorem prover to reason about categories. I would...

Aug2310 06:26 PM
icantadd

0 
576 
Hey!
I found one difficult equation for me...
It is:
Valid for real numbers a, b, c, d:
a + b = c + d
ad = bc...

Dec2812 12:09 PM
Michael Redei

3 
867 
Equations that have x^3 or x^4 etc...,are solved with method of Horner.
There is quicker way to solve an equation...

Sep2913 12:15 PM
h6ss

1 
680 
Greetings,
Given three points P1 P2 P3 on a circle in x,y,z coordinates, I am trying to figure out how to get the...

Apr1510 10:51 AM
HallsofIvy

3 
1,050 
Hi all
I have a loglog graph as attached and would like to find the equations of the lines plotted on it. If I...

Sep910 03:43 PM
a3sportback54

0 
1,418 
I was wondering if anyone had a good method for creating an equation from a set of coordinates. Let's say I have a...

Feb711 10:04 AM
jjj888

2 
1,714 
Not quite understanding what creates a plane, and what creates a line in 3D. Are vectors points in the plane with a...

Feb412 08:21 AM
lonewolf219

3 
2,070 
Dear All,
Currently I'm working out a formula for Destroyers in the online game BattleGround Europe to be able to...

Aug2306 03:53 PM
Adder_Noir

15 
1,498 
My maths skills are so rusty that I can't figure out how I simplify these equations so that I get a formula for x and...

Mar2013 06:40 PM
AlephZero

4 
643 
If we are asked to place 3 points on the surface of a sphere so that they are equidistant, it's easy to visualize that...

Apr314 09:54 PM
DrewD

10 
664 
Hi all,
How would you determine the angle i in the following equilateral triangle.
...

Jun313 04:00 PM
EvanT

2 
690 
Suppose I have a directed graph in Rn. Where the graph is a hypercube, (a square in R2, a cube in R3 etc).
Suppose...

Apr503 05:00 AM
Pauly Man

4 
7,360 
Question, List the members of the equivalance relation on {1,2,3,4,5} by the given partition. Identify the equivalance...

Apr1504 08:08 AM
ptex

7 
1,253 
Is there a way to figure out the number of equivalence classes for all graphs of order n, size k?

Jun1409 11:22 AM
CRGreathouse

1 
1,430 
Hi,
When I was just walking through the hallway of my department I found an exercise sheet asking the student to...

Nov1008 10:46 AM
HallsofIvy

3 
1,991 
Hey
I can't see how x~x+1 is an equivalence relation on the real numbers?
I don't understand what the relation...

Nov1309 08:57 AM
andlook

6 
1,158 
Sorry for such a basic question, but I don't know what they mean by the O, o, and ~ in a book I am reading. I'll write...

Dec1410 03:51 PM
mathman

1 
613 
Hi,
Here is my question. I need to prove the following an equivalence relation.
Let A = {1,2,3,4,5} X {1.2,3,4,5}...

Jun507 02:10 AM
Dream

8 
5,155 
Hi,
I'm reading a book on sets and it mentions a set B = {1,2,3,4}
and it says that
R3 = {(x, y) : x ∈ B ∧y ∈...

Apr2814 08:56 AM
kingstar

3 
468 