Respuesta :

rewrite 
(4.4) (4.5) * (10^6)(10^-10)
19.8 * (10^6)(10^-10)
multiplication of the coefficient is the addition of the exponent
6 - 10 is -4
so
19.8 * 10^-4
Rewrite 
1.98 * 10^-3

Hope this helps :)