Question

The use of electricity in the US in 1902 was 6.03 x 10^9 kilowatt-hours.
The use of electricity in the US in 1950 was 4.3 x 10^11 kilowatt-hours.

How many times more was the electricity used in 1950 than 1902? Express your answer in Scientific Notation.



a. 7.131 x 10

b. 10.33 x 10^20

c. 1.73 x 10^2

d. 2.6 x 10^20

Answer 1

To calculate how many times more electricity was used in 1950 than 1902, divide the electricity used in 1950 by the electricity used in 1902:

(4.3 x 10^11) / (6.03 x 10^9) = 71.43

Therefore, the electricity used in 1950 was 71.43 times more than the electricity used in 1902. In scientific notation, this is expressed as:

7.143 x 10^1

So the closest answer choice is a. 7.131 x 10.