Function f models a mini half pipe with a flat bottom, where x is the horizontal distance in inches and y is the vertical distance in inches.
(3x
60
55
8 &
50
45
40-
3838405
25
20
15
10
ch A
-5
+X
25 50 75 100 125 150 175 200 225 250 275 300
Skating from left to right, what is the average rate of change within the first 75 horizontal inches traveled?