Presumably the circumference of the foot ball is 15 feet?
If so then first we must find the radius by dividing 15 by 2*pi.
radius = 2.387324146 ft
Volume = 4/3*pi*2.3873241463 = 56.99316577 cubic ft
The foot ball contains about 57 cubic ft of air
A large foot ball indeed!!!
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1.2 (cubic feet) = 2073.6 cubic inches
16 cubic feet = 27,648 cubic inches
54,600 cubic inches = 31.6 cubic feet
one cubic meter is 35.3 cubic feet
31,104 cubic inches = 18 cubic feet.