# In Exercises, estimate the area under each curve by summing the area of rectangles. Use the left

## Question:

In Exercises, estimate the area under each curve by summing the area of rectangles. Use the left endpoints, then the right endpoints, and then give the average of those answers.

The following graph shows the rate of use of electrical energy (in millions of kilowatts) in a certain city on a very hot day. Estimate the total usage of electricity on that day. Let the width of each rectangle be 2 hours.

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