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OpenStudy (anonymous):
Surface Area of a Balloon The surface area S (in square meters) of a hot-air balloon is given by S(r) = 4π r2 where r is the radius of the balloon (in meters). If the radius r is increasing with time t (in seconds) according to the formula , t ≥ 0, find the surface area S of the balloon as a function of the time t.
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