i have to study only i know that i know nothing......

(4.92*10^-2)/(2.2*10^-4)

$$\\\frac{4.92\times 10^{-2}}{2.2*10^{-4}}\\\\ =\frac{4.92}{2.2}\times \frac{10^{-2}}{10^{-4}}\\\\ =2.2\dot3\dot6\times 10^{-2--4}\\\\ =2.2\dot3\dot6\times 10^{-2+4}\\\\ =2.2\dot3\dot6\times 10^{2}\\\\$$

(4.92*10^-2)/(2.2*10^-4)   rewrite as

(4.92 / 2.2) * (10^-2/10^-4)  

(2.2363636363636364) * (10^4 / 10^2)     negative exponents "travel" across the fraction bar

2.2363636363636364 * 10 ^2   (in scientific notation)

or just

223.63636363636364