Simplify$($ if requires$)$ and Express the following in Scientific Notations$($SN$),$ use E to designate $10$

Earth radius $=6380000m$ in $SN,$ Earth radius $=$

$3E-44\mathrm{.}2E6$ in $SN=$

$3E\frac{4}{4\mathrm{.}2}E6$ in $SN=$