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A spherical ball has a diameter of 8 inches.The ball has a slow leak in which the air escapes at the rate of 2.5 cubic inches per second. How long would it take the ball to deflate?

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The formula for volume of a sphere is 4/3pi(radius)^3

So 4/3(3.14 - better to use the pi button on your calculator)(4 cubed)
 
Punch into calculator (And I mean PUNCH that thing)

Volume = 268.08 in.^3. Divide this by 2.5 = 107.23 seconds.

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