Answer
$1.5 \times 10^{-6}$
Work Step by Step
$\dfrac{a^m}{a^n}=a^{m-n}, a\ne0$
Divide the corresponding parts while using the rule above to obtain:
$=\dfrac{4.65}{3.1} \times \dfrac{10^{-4}}{10^{2}}
\\=1.5 \times 10^{-4-2}
\\=1.5 \times 10^{-6}$
