Answer
$6.106\times10^{-11}$
Work Step by Step
Using the laws of exponents and the concepts of scientific notation, the given expression, $
(7.1\times10^{-7})(8.6\times10^{-5})
$, simplifies to
\begin{array}{l}
(7.1)(8.6)\times10^{-7+(-5)}
\\\\=
61.06\times10^{-12}
\\\\=
6.106\times10^{-11}
.\end{array}