Answer:
0.13 ft/min
Step-by-step explanation:
We are given that

We have to find the increasing rate of change of height of pile when the pile is 12 ft high.
Let d be the diameter of pile
Height of pile=h
d=h
Radius of pile,r=
Volume of pile=

h=12 ft
Substitute the values



Answer:
C
Step-by-step explanation:
(3,15) and (4,12)
2.2to 4 pages in a minute because 12 divided by 3 is 4 and 12 divided by 5 is 2.2