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.
To find out how many times more electricity was used in 1950 than in 1902, we need to divide the usage in 1950 by the usage in 1902:
(4.3 x 10^11) / (6.03 x 10^9)
First, divide the numerical parts:
4.3 / 6.03 = 0.7128
Then divide the exponential parts:
10^11 / 10^9 = 10^(11-9) = 10^2
Putting it all together:
0.7128 x 10^2 = 7.128 x 10^(-1) x 10^2 = 7.128 x 10^1
Therefore, the electricity used in 1950 was approximately 7.128 times more than in 1902. This can be expressed in scientific notation as 7.128 x 10^1.