Answer:
108617.1 cubic centimeter of air will be used to inflate 15 basketballs
Explanations:
The rocket basketball is spherical in shape
The amount of air that will take to inflate one basketball is the volume of the basketball
The volume, V, of a sphere is given by the formula:

Diameter of the baseball = 24 cm
The radius, r = diameter / 2
r = 24/2
r = 12 cm

Now, to inflate 15 basketballs:
Volume = 15 x 7241.14
Volume = 108617.1 cubic centimeter