## Search found 23 matches

Mon Oct 04, 2010 12:33 am
Forum: Intermediate Algebra
Replies: 1
Views: 976

### Re: radius of circle is 1m > radius of another; find both ra

The eqn for the area of a circle is $A=\pi r^2$.
Sun Oct 03, 2010 1:21 pm
Topic: need held dividing x^2-10x+50/x^4-15x^3+50x^2+250x-2500
Replies: 2
Views: 2097

### Re: need held dividing x^2-10x+50/x^4-15x^3+50x^2+250x-2500

You cna learn how to do the factoring by going [url=hhttp://www.purplemath.com/modules/solvpoly2.htm]here[/url]
Thu Jul 29, 2010 10:24 pm
Topic: techniques for finding an expression for geometric seqeunces
Replies: 1
Views: 1664

### Re: techniques for finding an expression for geometric seqeu

They've got a lesson here: http://www.purplemath.com/modules/series3.htm

You can use the fomrulas. Like for 4,8,16,32,64, you have r=2, a=4. then an=a*2n-1. And a=4=22, so an=(22)(2n-1)=22+n-1=2n+1.
Fri Apr 02, 2010 9:19 pm
Forum: Trigonometry
Topic: Solving trigonometry algebraically
Replies: 2
Views: 2683

### Re: Solving trigonometry algebraically

start w/ y=y then 3/tanx=2sinx so 3cosx/sinx=2sinx
3cosx=2sin^2x=2(1-cos^2x)
3cosx=2-2cos^2x
2cos^2x+3cosx-2=0
Tue Mar 09, 2010 7:39 pm
Forum: Discrete Math
Topic: probability point selected on segment is within 2 units of 8
Replies: 2
Views: 3066

### Re: probability point selected on segment is within 2 units of 8

How did you get a distance of five units between 6 and 10?

What is the length of the whole line? What is the length that you want to hit? Divide the first by the second.
Wed Sep 09, 2009 7:22 pm
Forum: Matrix (Linear) Algebra
Topic: is there a 2x2 matrix A so A2 = -I?
Replies: 2
Views: 5141

### is there a 2x2 matrix A so A2 = -I?

is there a 2x2 matrix A so A2 = -I?
(I is ident matrix)
Tue Jul 28, 2009 4:46 pm
Forum: Geometry
Topic: find sruface area of sphere with cube inside with edge=1
Replies: 6
Views: 5831

### Re: find sruface area of sphere with cube inside with edge=1

ill try that
thnx
Fri Jul 24, 2009 4:21 pm
Forum: Geometry
Topic: find sruface area of sphere with cube inside with edge=1
Replies: 6
Views: 5831

### Re: find sruface area of sphere with cube inside with edge=1

i guess i hadnt looked at it that way
that helps me picture it but still dont no how 2 find r??
tryed drawing it but cant get numbers??
Mon Jul 20, 2009 4:12 pm
Forum: Geometry
Topic: find sruface area of sphere with cube inside with edge=1
Replies: 6
Views: 5831

### Re: find sruface area of sphere with cube inside with edge=1

how do u use the cube to find the radius????
Sun Jul 19, 2009 12:22 pm
Forum: Geometry
Topic: find sruface area of sphere with cube inside with edge=1
Replies: 6
Views: 5831

### find sruface area of sphere with cube inside with edge=1

problem- cube in a shpere edge of cube=1
i need to find teh surface area of the sphere??