Question

If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?

Answer 1

Given: 280 watts power a day
            
Unknown: KwH=?in 30 days
Solution: 280 watt-hours per day/1000x30 days
               .28 x 30=n
Answer:8.4 kwh

Answer 2

dont answer 8.4, its wrong

Plato