Answer
$1.296\times10^{22}$
Work Step by Step
Using the laws of exponents and concepts of scientific notation, the given expression, $
(2.4\times10^5)(5.4\times10^{16})
,$ simplifies to
\begin{array}{l}\require{cancel}
(2.4\cdot5.4)\times10^{5+16}
\\\\=
12.96\times10^{21}
\\\\=
1.296\times10^{22}
.\end{array}
