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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