express this number in scientific notation. 3,868,000,000

Explanation:

Step1: Recall scientific - notation form

Scientific notation is $a\times10^{n}$, where $1\leqslant|a|\lt10$ and $n$ is an integer.

Step2: Move decimal point

For the number $3868000000$, move the decimal point 9 places to the left to get $a = 3.868$. Since we moved the decimal point 9 places to the left, $n = 9$.

Answer:

$3.868\times10^{9}$