Question

1.9ap - 14 which of the following numbers is written in scientific notation? select all that apply. a. 3.42×10^(-9) b. 5.99×10^(-9) c. 18.0×10^(-9) d. 1.80×10^(9) click to select your answer(s) and then click check answer.

Explanation:

Step1: Recall scientific - notation form

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

Step2: Check option A

For $3.42\times10^{-9}$, $a = 3.42$ (where $1\leq3.42\lt10$) and $n=-9$ (an integer), so it is in scientific notation.

Step3: Check option B

For $5.99\times10^{-9}$, $a = 5.99$ (where $1\leq5.99\lt10$) and $n = - 9$ (an integer), so it is in scientific notation.

Step4: Check option C

For $18.0\times10^{-9}$, since $a = 18.0\geq10$, it is not in scientific notation.

Step5: Check option D

For $1.80\times10^{9}$, $a = 1.80$ (where $1\leq1.80\lt10$) and $n = 9$ (an integer), so it is in scientific notation.

Answer:

A. $3.42\times10^{-9}$, B. $5.99\times10^{-9}$, D. $1.80\times10^{9}$