Answer
$2.5\times10^{13}$
Work Step by Step
Using the laws of exponents and the concepts of scientific notation, the given expression, $
\dfrac{8.5\times10^8}{3.4\times10^{-5}}
$, simplifies to
\begin{array}{l}
(8.5\div3.4)\times10^{8-(-5)}
\\\\=
2.5\times10^{13}
.\end{array}