The surface area S (in square meters) of a hot-air balloon is given by where r is the
Chapter 6, Problem 65(choose chapter or problem)
The surface area S (in square meters) of a hot-air balloon is given by 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 find the surface area S of the balloon as a function of the time t
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