#Must I solve this algebraically? Or is there some method I'm not aware of.

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kind oasis
lucid egretBOT
ivory mirage
# kind oasis

they are finding rate change of volume of the sphere. they have given radius of the sphere as a function of time. dS/dt = dS/dr * dr/dt. just differentiate S wrt r, r wrt t and multiply.

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its not algebra. its calculus

kind oasis
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I meant part b