Question

A spherical basketball has a diameter of 18 cm.

Answer 1

Use the formula 4/3 x pi x r^3  with R being 9
You get 3053.6

Answer 2

V=(4πr^3)/3 and we are told that d=18cm, so r=9cm thus

V=(4π9^3)/3

V=972π cm^3

V≈3053.63 cm^3 (to nearest hundredth of a cubic centimeter)