The graph shows the depth of water W in a reservoir over a one-year period as a function of the number of days x since the beginning of the year. What was the average rate of change of W between

x = 150 and x = 300y

Assume that the points lie on the grid lines.

y = ft/day

 

 

W (ft) 250+ 225 200 175 150- 125 100- 75 50 25 x (days) 50 100 150 200 250 300 350 400