Explanation
make the division
[tex]\begin{gathered} \frac{6\cdot10^9}{2\cdot10^{-3}}=\frac{6}{2}\cdot\frac{10^9}{10^{-3}} \\ \frac{6}{2}\cdot\frac{10^9}{10^{-3}}=3\cdot10^{9-(-3)} \\ =3\cdot10^{9+3} \\ =3\cdot10^{12} \end{gathered}[/tex]I hope this helps you
