Answer
$256$
Work Step by Step
Using $\dfrac{a^x}{a^y}=a^{x-y}$, then the expression, $
\dfrac{4^7}{4^3}
$, simplifies to
\begin{array}{l}\require{cancel}
4^{7-3}
\\\\=
4^{4}
\\\\=
256
.\end{array}
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