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

Multiply coefficients and add powers: 2.6×1021
Multiply coefficients and add powers: 2.6×1021

Subtract coefficients and divide powers: 1.73×102
Subtract coefficients and divide powers: 1.73×102

Divide coefficients and subtract powers: 7.13×101
Divide coefficients and subtract powers: 7.13×101

Add coefficients and add powers: 10.33×1020
Add coefficients and add powers: 10.33×1020

Divide coefficients and subtract powers: 1.4 x 102
Divide coefficients and subtract powers: 1.4 x 102

Answer 1

To calculate how many times more electricity was used in 1950 than in 1902, you need to divide the amount of electricity used in 1950 by the amount used in 1902.

(4.3 x 10^11) / (6.03 x 10^9) = 7.13 x 10^1

Therefore, the electricity used in the US in 1950 was 7.13 x 10^1 times more than in 1902.

So, the correct answer is:
Divide coefficients and subtract powers: 7.13 x 10^1