5. A hair dryer is used for 7.5 hours one month. It uses 600 watts of power, on average. How much electrical energy does the hair dryer use in a month? How much would it cost to use the hair dryer each month if the rate charged by the electric company is $0.09 per kWh? Physical Science Name: 6. A stereo is used for 90 hours per month. It costs $0.88 to run the stereo each month. If the electric company charges $0.09 per kWh, what electric energy is used by the stereo? What power is used