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OpenStudy (anonymous):
Let S(r) denote the surface area of a sphere of radius r. Recall that the formula for S(r) is S(r)=4πr2. Use this information to determine the rate of increase (with respect to r) in the surface area of a spherical balloon when: (A) r=1 inches: Rate of increase = (B) r=3 inches: Rate of increase = (C) r=5 inches: Rate of increase =
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