Answer
$3.0\times10^{-1}$
Work Step by Step
Using laws of exponents, the given expression simplifies to
\begin{align*}
&
\dfrac{0.00048}{0.0016}
\\\\&=
\dfrac{4.8\times10^{-4}}{1.6\times10^{-3}}
\\\\&=
(4.8\div1.6)(10^{-4}\div10^{-3})
\\\\&=
3.0\times10^{-4-(-3)}
\\\\&=
3.0\times10^{-1}
.\end{align*}