Answer
$s^{11}$
Work Step by Step
Using $a^x\cdot a^y=a^{x+y}$, then the given expression, $
s^4\cdot s^5\cdot s^2
$, simplifies to
\begin{array}{l}\require{cancel}
s^{4+5+2}
\\\\=
s^{11}
.\end{array}
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