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To find the rate of change in the number of gallons in the pool after each hour has passed, we need to calculate the slope of the line passing through the points (1,160) and (3,80).
Slope = (y2 - y1) / (x2 - x1)
Slope = (80 - 160) / (3 - 1)
Slope = (-80) / 2
Slope = -40
Therefore, the rate of change in the number of gallons in the pool after each hour has passed is -40 gal/hr.