Which number is written using standard scientific notation

A. 10.29 x 10^3

B. 40 x 10^9

C. 0.1 x 10^-1

D. 2.98 x 10^11

The answer is

D) 2.98 x 10^11

Explanation:

To be written in scientific notation, the first number or the number being multiplied by 10^# must be written like this Ex. 1.0 2.0 3.0 etc. In other words it must have one and only one digit to the left of the decimal and answer choice D is the only answer choice that meets the criteria.