Answer
$13\sqrt{3}$
Work Step by Step
Using $a(b+c)=ab+ac$, or the Distributive Property, the given expression, $
9\sqrt{3}+4\sqrt{3}
,$ simplifies to
\begin{array}{l}\require{cancel}
(9+4)\sqrt{3}
\\\\=
13\sqrt{3}
.\end{array}
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