A volume question with improper integral

[transgalactic]

i added a link with the question and how i tried to solve it

http://img167.imageshack.us/my.php?image=img8215vv0.jpg

 

[HallsofIvy]

Where did you get the idea that e^-2x goes to infinity as x goes to infinity! Look at the graph you drew! e^-x, and certainly e^-2x, goes to 0 as x goes to infinity.

 

[transgalactic]

thank you