Convert the following two numbers to standard notation:

3.9×103\displaystyle {3.9}\times{10}^{{3}} =

7.9×103\displaystyle {7.9}\times{10}^{{-{{3}}}} =

Convert the following two numbers to scientific notation:

99000\displaystyle {99000} = a×10b\displaystyle {a}\times{10}^{{b}}     where a=\displaystyle {a}= and b=\displaystyle {b}=

0.00063\displaystyle {0.00063} = a×10b\displaystyle {a}\times{10}^{{b}}    where a=\displaystyle {a}= and b=\displaystyle {b}=