A spherical balloon is being inflated. Find the rate (in ft2/ft) of increase of the surface area (S = 4πr²) with respect to the

Question

A spherical balloon is being inflated. Find the rate (in ft2/ft) of increase of the surface area (S = 4πr²) with respect to the radius r when r is each of the following.
(a) 2 ft = _______ ft²/ft
(b) 3 ft = _______ ft²/ft
(c) 7 ft = ________ ft²/ft

Kunduz · Accepted Answer

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