Solve the problem.The surface area of a balloon is given by S(r) = 4?r2, where r is the radius of the balloon. If the radius is increasing with time t, as the balloon is being blown up, according to the formula   find the surface area S as a function of the time t.

A. S(r(t)) = ?t6
B. S(r(t)) = ?t6
C. S(r(t)) = ?t9
D. S(r(t)) = ?t3

Answer: A

Mathematics

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