1. To solve this problem, you must aplpy the formula for calculate the volume of a sphere, which is:
V=4/3(πr)
V is the volume of the sphere.
r is the radius of the sphere.
2. You must calculate the radiius. You have that the beach ball has a diameter of 18 inches, then:
r=diametert/2
r=18 inches/2
r=9 inches
3. When you substitute r= 9 inches into the formula, you obtain:
V=4/3(πr)
V=3053.62 inches³