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kilowatts). Estimate the total daily 14- usage of electricity by summing the area of rectangles. Use the left 12 endpoints, then the right endpoints, then give the average of those 10- results as the answer. Let the Millions of kilowatt-hours width of each rectangle be 2 hours. Midnight 4 A.M. 8 A.M. Noon 4 P.M. 8 P.M. Midnight The estimate of the city's total daily usage of electricity for the given day, found by averaging the estimates using left and right endpoints, is million kw-hrs. (Round to the nearest whole number as needed.)