SOLUTION: I have been stuck on this problem for quite a while and need some help. I would appreciate it if someone could please help me out with this problem. The problem is: For pi, please

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: I have been stuck on this problem for quite a while and need some help. I would appreciate it if someone could please help me out with this problem. The problem is: For pi, please      Log On


   

Question 791313: I have been stuck on this problem for quite a while and need some help. I would appreciate it if someone could please help me out with this problem. The problem is:
For pi, please use 3.14. Thanks!
The volume of a cylinder is 980 (pi) in^3. The height of the cylinder is 20 in. What is the radius of the cylinder?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The volume of a cylinder is 980 (pi) in^3.
The height of the cylinder is 20 in.
What is the radius of the cylinder?
:
The equation
pi%2Ar%5E2%2A20 = 980%2Api
divide both sides by pi, resulting in:
r%5E2%2A20 = 980
divide both sides by 20
r%5E2 = 980%2F20
r%5E2 = 49
r = sqrt%2849%29
r = 7 in is the radius
:
:
You can check this in the original equation
pi%2A7%5E2%2A20 = 980%2Api