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A tank holds 3000 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) 5 10 15 20 25 30 V (gal) 2049 1296 780 345 87 (a) If P is the point (15, 780) on the graph of V, find the slopes of the secant lines PQ when Q Is the point on the graph with the following values. (Round your answers to one decimal place.) Q slope (5, 2049) (10, 1296) (20, 345) (25, 87) (30, 0) (b) Estimate the slope of the tangent line at P by averaging the slopes of two adjacent secant lines. (Round your answer to one decimal place.) Need Help? Read It Watch It Master It