If the diameter of a men’s basketball is 10 inches and a women’s is 9 inches, what is the approximate difference of their volumes?

A basketball is approximately a sphere, so use V = (4/3)πr³. The radii are 5 inches and 4.5 inches, giving a volume difference of (4/3)π(5³ − 4.5³) = (4/3)π(125 − 91.125) ≈ 141.9 cubic inches. The approximate difference is 141.9 in.³, choice C.

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