Sand falls from an overhead bin, accumulating in a conical pile with a radius that is always three times its height. if the sand falls from the bin at a rate of 120 (ft^3)/min, how fast is the height of the sandpile changing when the pile is 10 feet high? [v =1/3(r^2)h]

a ≈ 172.05

step-by-step explanation:

the pictures.

8.75

how-to:

first, we need to find what we have to work with.

since i know that we have 7 (years) and 0.8 (inches), we can use these to solve and find the equation!

secondly, what you want to do, is see that we need to know how much growth out of the 0.8 inches he got in only 1 year, instead of 7 years.

let's try to divide.

7 ÷ 0.8 = 8.75