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Differential Calculus for dV/dt or dr/dt

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Suppose that the radius r and volume V = r3 of a sphere are differentiable functions of t. Write an equation that relates dV/dt to dr/dt.

a. dV/dt = 4/3 r^2dr/dt

b. dV/dt = 4r dr/dt

c. dV/dt = 3r^2dr/dt

d. dV/dt = 4 r^2dr/dt

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