Answer
$T=\sqrt[3] x\ d^2$
Work Step by Step
Step 1. Write the general form as $T=k\sqrt[3] x\ d^2$ where $k$ is a constant.
Step 2. Use the given condition, $18=k\sqrt[3] 8\ 3^2$, thus $k=1$
Step 3. We have $T=\sqrt[3] x\ d^2$
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