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 (in gallons) after t minutes. If P is the point (15, 267 ) on the graph of V, find the slope of the secant line PQ when Q is the point on the graph with t = 25. t (min) 5 10 15 20 25 30 V (gal) 719 466 267 113 25 0 Choose the correct answer from the following: 1. 2. 3. 4. 5. 6. 17. 8 -17. 8 30. 8 24. 2 -45. 2 -24. 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50