Which number is written in scientific notation?

A. 4.5*10^-3

B. 14.5*10^2

C. 0.78*10^-6

D. 5.7*4^8

Yeah it's A

Step-by-step explanation:

Took the quiz

Option A is correct, i. e. 4.5*10^-3

Step-by-step explanation:

To write scientific notations:-

1. The first digit should be non-zero.

2. The decimal representation should be a number greater than 1 and less than 10.

3. The exponent representation should be in form of 10's power.

Checking given options:-

B. 14.5*10^2

Given option B has decimal representation greater than 10, so it is NOT correct.

C. 0.78*10^-6

Given option C has decimal representation less than 1, so it is NOT correct.

D. 5.7*4^8

Given option D has exponent representation NOT in form of 10's power, so it is NOT correct.

Checking option A: - 4.5*10^-3

Given option A has decimal representation between 1 and 10. Also it has exponent representation in form of 10's power.

Hence, option A is correct, i. e. 4.5*10^-3