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A laptop computer uses approximately 8.4 x 10(-3) kilowatt-hours of energy in 3.5x10(-1) hours. How many kilowatt-hours of energy does the laptop use per hour?

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the things in parentheses are exponents​

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Answer:

A laptop uses between 50 and 100 W/hour when it is being used, depending on the model. A laptop that is on for eight hours a day uses between 150 and 300 kWh and emits between 44 and 88 kg of CO2 per year. In stand-by mode the power consumption of both a desktop and a laptop falls to about a third.

Step-by-step explanation:

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