Answer
$\displaystyle \frac{1}{64}$
Work Step by Step
We simplify:
$\displaystyle 16^{-3/2}=((16)^{1/2})^{-3}=((4^2)^{1/2})^{-3}=4^{-3}=\frac{1}{4^3}=\frac{1}{64}$
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