A tank holds 2 000 gallons of water which drains from the bottom of the tank in half an hour The values in the table show th remaining in the tank in gallons after t minutes t min V gal a If P is the point 15 520 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 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 Step 1 msec 5 msec 10 1 376 890 a If P is the point 15 520 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 Slopes of secant lines passing through P 15 520 and Q t V t can be calculated using the following V t 520 t 15 15 20 25 30 520 520 212 56 0 We begin by calculating the slope when t 5 In the last step round your answer to one decimal place V 5 520 5 15 Updates Available Do you want to inst