You should know that the volume of a cone is and you are given
The question is asking you to find .
From the chain rule we know that
Do you know how to proceed from there?
Spoiler:
the radius of a cone is increasing at a rate of 3 in/sec, and the height of the cone is 3 times the radius. Find the rate of change for the volume of that cone when the radius is 7 inches.
The textbook is no help and the prof doesnt teach.
any help will be appreciated
I did that before but it is different from the answer i have. The answer for the question is 441pi = 1385.4 from the final review sheet. I tried every way possible that I know of but couldnt get 441pi = 1385.4.
edit - what you did seem to be the correct way but the outcome is different from the answer on my final review sheet. I was doing your way before i came here, but my answer never match the solution on the review sheet.