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.

What was the total kilowatt-hours of electricity used during these two years?

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(6. 03 x 10^9) + (4. 3 x 10^11)= 10. 33 x 10^20 = 1. 033 x 10^19

(6. 03 x 10^9)+(4. 3 x 10^11) = (0. 0603 x 10^11) + (4. 3 x 10^11)=4. 3603 x 10^11

(6. 03 x 10^9) x (4. 3 x 10^11) = 25. 929 x 10^20= 2. 6 x 10^19

(6. 03 x 10^9) x (4. 3 x 10^11) = 25. 929 x 10^2=2. 6 x 10^1