MY NOTES PRACTICE AA tank holds 1,000 gallons of water, which drains from the bottom...

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MY NOTES PRACTICE AA tank holds 1,000 gallons of water, which drains from the bottom of the tank in half an hour. The values in the table show the volume V of water remaining in the tank (in gallons) after t minutes.t (min) 5686 438 255 116V (gal)(a) If P is the point (15, 255) on the graph of V, find the slopes of the secant lines PQ when Q is the point on the graph with t-5, 10, 20, 25, and 30. (Round your answers to one decimal place.)SlopeQ(5, 686)(10, 438)(20, 116)(25, 28)(30, 0)1015 2025 3028(b) Estimate the slope of the tangent line at P by averaging the slopes of the two adjacent secant lines corresponding to the two points closest to P. (Round your answer to one decimal place.)

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