Answer
$-2.21\times10^{-11}$
Work Step by Step
Using scientific notation and the laws of exponents, the given expression, $
\dfrac{(-0.00017)(0.00039)}{3000}
$, simplifies to
\begin{array}{l}
\dfrac{(-1.7\times10^{-4})(3.9\times10^{-4})}{3\times10^{3}}
\\\\=
(-1.7)(3.9)\div3\times10^{-4+(-4)-3}
\\\\=
-2.21\times10^{-11}
.\end{array}
