select the correct answer. anna learns in her science class that the human eye blinks an average of…

select the correct answer. anna learns in her science class that the human eye blinks an average of 4,200,000 times a year. what is this number expressed in scientific notation? a. 4.2e6 b. 4.2e - 6 c. 42e6 d. 4.2e5 e. 4.2e - 5

select the correct answer. anna learns in her science class that the human eye blinks an average of 4,200,000 times a year. what is this number expressed in scientific notation? a. 4.2e6 b. 4.2e - 6 c. 42e6 d. 4.2e5 e. 4.2e - 5

Answer

Explanation:

Step1: Recall scientific - notation form

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

Step2: Convert 4200000 to scientific notation

Move the decimal point 6 places to the left to get $a = 4.2$. Since we moved the decimal point 6 places to the left, $n=6$. In E - notation, $4.2\times10^{6}$ is written as 4.2E6.

Answer:

A. 4.2E6