Water leaks from a tank at the rate of r(t) gallons per hour. The rate decreased as time passed, and values of the rate at two-hour time intervals are shown in the table below. The total amount of water that leaked out is evaluated by a Riemann sum. Find the upper estimate (left end-points of each rectangle) for the total amount of water that leaked out by using five rectangles.
Give your answer with one decimal place.

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Left Sum = 2 * (r(0) + r(2) + r(4) + r(6) + r(8))
= 2 * (10.7 + 8.6 + 6.6 + 5.2 + 5.0)
= 72.2

@Agl202 could you write of out the Rieman Sum/ Sigma Notation?

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