The radius of the sphere is half of its diameter, so the radius is 30/2 = 15 inches.
The formula for the volume of a sphere is V = (4/3)πr³, where r is the radius.
Substituting the given values, we get:
V = (4/3)π(15)³
V = (4/3)π(3375)
V = 4500π
Therefore, the volume of the sphere is 4500π cubic inches.