1 answer
(click or scroll down)
The rate of change can be calculated using the formula:
Rate of change = (y2 - y1) / (x2 - x1)
Plugging in the values:
Rate of change = (80 - 160) / (3 - 1)
Rate of change = (-80) / 2
Rate of change = -40
Therefore, the rate of change in the number of gallons in the pool after each hour has passed is -40 gal./hr.