Answer
$64$.
Work Step by Step
$=16^{\frac{3}{2}}$
We can write $16=4^2$
The expression becomes
$=(4^2)^{\frac{3}{2}}$
Multiply powers.
$=(4)^{2\cdot \frac{3}{2}}$
Simplify.
$=(4)^{3}$
$=4\cdot 4\cdot 4 $
$=64$.
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