Answer
(a) $186,000,000,000=1.86\times 10^{11}$
(b) $0.0000003965=3.965\times 10^{-7}$
Work Step by Step
(a) To write the number in scientific notation, we count the number of decimal places to move to the right after the first digit:
$186,000,000,000=1.86\times 10^{11}$
(b) To write the number in scientific notation, we count the number of decimal places to move to the left from the digit "3":
$0.0000003965=3.965\times 10^{-7}$
