Pierce Black
05/19/2023 · Middle School
A sugar cube is put into the coffee. The sugar keeps its cube shape as it dissolves. As the sugar cube dissolves, its volume decreases at the constant rate of \( \frac{1}{20} \mathrm{~cm}^{3} / \mathrm{sec} \). Let \( x(t) \) be the sidelength of the cube at time \( t \). Find the rate of change of \( x(t) \) when the volume of the cube reaches \( \frac{1}{64} \mathrm{~cm}^{3} \).
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The rate of change of the side length \( x(t) \) when the volume is \( \frac{1}{64} \, \text{cm}^3 \) is \( -\frac{4}{15} \, \text{cm/sec} \).
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