A tank holds 1000 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 (n galons) whert mindes (min) V (gal) S 10 15 20 25 30 685 448 240 101 29 0 (a) If P is the point (15, 240) on the graph of V, find the slopes of the secant lines PQ when Q is the p slope (5.805) (10, 440) (20, 101) (25, 29) (30, 0) 444 -38.8 27.8 -22.2 -16.7 ✓ x x x the graph the following values (Round your i (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) -431 MY

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