Answer
(a) $1.86 \times 10^{11}$
(b) $3.965 \times 10^{-7}$
Work Step by Step
(a)
Move the decimal point 11 places to the left to have $1.86$, then muliply $10^{11}$ to retain the value to have:
$=1.86 \times 10^{11}$
(b)
Move the decimal point seven places to the right to have $3.965$, then multiply $10^{-7}$ to retain value and have:
$=3.965 \times 10^{-7}$
