Electric power costs 17.8 cents per kWh in Los Angeles in July 2017 (compared to the national average of 14.3 cents per kWh). How much did it cost (in cents) to run a 1500 W hair dryer for 10 minutes in Los Angeles during July 2017? Assume 3 significant digits in your answer.

Answer:The cost to run a 1500 W hair dryer for 10 minutes in Los Angeles during July 2017 is:                    4.45 centsStep-by-step explanation:Electric power costs 17.8 cents per kWh in Los Angeles in July 2017.Now we are asked to find the cost to run  a 1500 W hair dryer for 10 minutes in Los Angeles during July 2017.We know that: 1 w=0.001 kWThis means that:    1500 W= 1.500 kWAlso, it is used for 10 minutesi.e. 1/6 hoursHence, the electric power used to run the hair dryer is: 1.500×(1/6)i.e. Electric power to used by hair dryer is: 0.25 kWhCost of 1 kwh is: 17.8 centsThis means that cost of 0.25 kwh is: 17.8×0.25                                                         =  4.45 centsHence, the answer is:                       4.45 cents