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.

(2 points)
Responses

A. Divide coefficients and subtract powers: 7.13×10^1

B. Subtract coefficients and divide powers: 1.73×10^2

C. Add coefficients and add powers: 10.33×10^20

D. Multiply coefficients and add powers: 2.6×10^21

E. Divide coefficients and subtract powers: 1.4 x 10^2

Answer 1

D. Multiply coefficients and add powers: 2.6×10^21

The electricity used in 1950 was approximately 2.6 x 10^21 times more than in 1902.