Convert the following two numbers to standard notation:

$\displaystyle {4.7}$ $\displaystyle \times$ $\displaystyle {10}^{{5}}$ =

$\displaystyle {6.7}$ $\displaystyle \times$ $\displaystyle {10}^{{-{{3}}}}$ =

Convert the following two numbers to scientific notation:

$\displaystyle {2100}$ = $\displaystyle \times$ 10^

$\displaystyle {0.00049}$ = $\displaystyle \times$ 10^