Question

select the correct answer. choose the correct scientific notation for the given number. the diameter of a red blood cell is about 0.007 of a millimeter. 7.0×10⁻³ 70×10⁻² 0.7×10⁻² 7.0×10³

Explanation:

Step1: Recall scientific - notation form

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

Step2: Convert 0.007 to scientific notation

Move the decimal point 3 places to the right to get $a = 7.0$. Since we moved the decimal point 3 places to the right, $n=-3$. So $0.007 = 7.0\times10^{-3}$.

Answer:

A. $7.0\times10^{-3}$