Problem

The amount of energy (in kilowatt hours) a new refrigerator typically used for a year of o...

The amount of energy (in kilowatt hours) a new refrigerator typically used for a year of operation can be approximated by the function h(x) = −1.44x2 + 220x − 6953, where x = 50 corresponds to the year 1950. According to this model, what year did peak electrical use occur? What was that amount?

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