Answer
$7^{19}$
Work Step by Step
Using $x^a \cdot x^b=x^{a+b}$ or the product rule, the given expression, $
7^9\cdot 7^{10}
,$ simplifies to
\begin{array}{l}\require{cancel}
7^{9+10}
\\\\=
7^{19}
.\end{array}
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