The use of eletricty in the US in 1902 was 6.03 times 10^9 kilowatt-hours.
The use of eletricty in the US in 1950 was 4.3 times 10^11 kilowatt-hours.
What was the total kilowatt-hours of eletricty used during these two years?
To find the total kilowatt-hours of electricity used during these two years, we simply add the amount of electricity used in 1902 to the amount used in 1950.
Total kilowatt-hours = 6.03 x 10^9 + 4.3 x 10^11
Total kilowatt-hours = 6.03 x 10^9 + 430 x 10^9
Total kilowatt-hours = 436.03 x 10^9
Total kilowatt-hours = 4.3603 x 10^11
Therefore, the total kilowatt-hours of electricity used during 1902 and 1950 was 4.3603 x 10^11 kilowatt-hours.