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a spherical balloon with radius r inches has volume V9r) =(4/3)πr^3. Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r+1 inches

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    Additional volume of air required
    =f(r+1)-f(r)
    =(4/3)π(r+1)³ - (4/3)πr³
    = ...

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