Which of the following is the best first step in solving the equation below?

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Aa at 9 a.m. it at 4 p.m. he a of $28.84.?

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.