# What expression is equivalent to (2a)^-4?

$\frac{1}{16 {a}^{4}}$
Hint: ${a}^{- n} = \frac{1}{a} ^ n$
${\left(2 a\right)}^{-} 4$ = $\frac{1}{2 a} ^ 4$ = $\frac{1}{2} ^ 4 \times \frac{1}{a} ^ 4$ = $\frac{1}{16 {a}^{4}}$