Question

What is the volume of a sphere with a radius of 9 inches

Answer 1

To work out the volume of a sphere, you have to...
4/3 pi x radius ^3
4/3 pi x 9^3 = 3053.63 (units cubed)
Hope this helps :)

Answer 2

V = 4/3 * pi * r^3

V = 4/3 * pi * 9^3

V = 972pi

Or if you want to approximate 3.14 for pi:

V = 972(3.14)

V = 3052.08