Answer
$\frac{1}{81}$
Work Step by Step
We know that $a^{−n}=\frac{1}{a^{n}}$ (as long as a is a nonzero real number and n is an integer).
Therefore, $(-3)^{-4}=\frac{1}{(-3)^{4}}=\frac{1}{-3\times-3\times-3\times-3}=\frac{1}{81}$.
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