In order to calculate this product, we need to use the following property:
[tex]a^b\cdot a^c=a^{b+c}[/tex]So we have:
[tex]\begin{gathered} 4.4\cdot10^{-7}\cdot3\cdot10^{-3} \\ =4.4\cdot3\cdot10^{-7}\cdot10^{-3} \\ =13.2\cdot10^{-7}\cdot10^{-3} \\ =13.2\cdot10^{-7+(-3)} \\ =13.2\cdot10^{-7-3} \\ =13.2\cdot10^{-10} \end{gathered}[/tex]