The use of electricity in 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.
What was the total kilowatt-hours of electricity used during these two years?
A. (6.3 x 10^(9))x(4.3x10^(11))=25.929x10^(2)=2.6x10^(1)
B. (6.3 x 10^(9))+(4.3x10^(11))=10.33x10^(20)=1.033x10^(19)
C. (6.3 x 10^(9))+(4.3x10^(11))=0.063x10^(11)+(4.3x10^(11))=4.3
D. (6.3 x 10^(9))x(4.3x10^(11))=25.929x10^(20)=2.6x10^(19)
B. (6.3 x 10^(9))+(4.3x10^(11)) = 6.3 x 10^9 + 4.3 x 10^11 = 4.3063 x 10^11 = 4.3 x 10^11
Therefore, the total kilowatt-hours of electricity used during these two years was 4.3 x 10^11 kilowatt-hours.