Answer
$\frac{dV}{dt} = 3x^2~\frac{dx}{dt}$
Work Step by Step
$V = x^3$
$\frac{dV}{dx} = 3x^2$
$\frac{dV}{dx}\cdot \frac{dx}{dt} = 3x^2~\frac{dx}{dt}$
$\frac{dV}{dt} = 3x^2~\frac{dx}{dt}$
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