Sand is being poured into a pile that has the shape of a cone. The height of the pile, in feet, is given below at various numbers of minutes, 1, that sand has been pouring out. At what average rate did the height of the
pile change over the interval 35158?
0
1
2.
3
4
5
6.
7
8
9
1 (minutes)
h (feet)
0
3.2
5.8
8.2
10.4
12.1
13.5
14.7
15.8
16.6
feet
(1) 1.52
minute
(3) 1.84
feet
minute
(2) 0.66
minutes
feet
feet
(4) 0.52
minute