# Am I doing this calculus problem right?? (related rates)?

• Oct 8th 2008, 05:58 PM
imbored205
Am I doing this calculus problem right?? (related rates)?
Here is the question #42 part A and B

http://i202.photobucket.com/albums/a...red205/CLA.jpg

This is the work I have done so far and I would like to know if it is right

http://i202.photobucket.com/albums/a...205/Work-3.jpg

If I am doing anything wrong please correct me. Also when I replace r with (3/5)h I think it's supposed to be (3/6).
• Oct 8th 2008, 07:09 PM
Chris L T521
Quote:

Originally Posted by imbored205
Here is the question #42 part A and B

http://i202.photobucket.com/albums/a...red205/CLA.jpg

This is the work I have done so far and I would like to know if it is right

http://i202.photobucket.com/albums/a...205/Work-3.jpg

If I am doing anything wrong please correct me. Also when I replace r with (3/5)h I think it's supposed to be (3/6).

All looks well...until you replace r in part (b).

It should be $\displaystyle r=\frac{2.5}{5}h$. You can make this adjustment by keeping in mind that the radius has a value of 3 only when the height is 6. It is also good to take note that the radius is half the value of the height withing the cone...

--Chris