Question

what is the correct scientific notation for 0.00089? 0.089×10⁻² 8.9×10⁻⁴ 89×10⁻⁵ 0.89×10⁻³

Explanation:

Step1: Recall scientific - notation rule

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

Step2: Convert 0.00089 to scientific notation

Move the decimal point 4 places to the right to get a number between 1 and 10. So, $a = 8.9$ and since we moved the decimal point 4 places to the right, $n=-4$. The scientific - notation is $8.9\times10^{-4}$.

Answer:

B. $8.9\times 10^{-4}$