1. The problem statement, all variables and given/known data Let R be the region bounded by the graph y=(1/x)ln(x), the x-axis, and the line x=e. Find the volume of the solid formed by revolving the region R about the y-axis. The interval should be (on the x-axis) from 1 to e and from the y-axis, it should be from 1 to (1/e) the area of the region is 1/2 2. Relevant equations [tex]V=\pi\int(top^2-bottom^2) over an interval [/tex] (at least, that is what I use when rotating an area over the x-axis, I've never had the y-axis before) 3. The attempt at a solution I was able to get the area quite easily, but when reading on how to find the volume, it said to write the equations in terms of y, so Iwas able to get f(y)=e REALLY easily, but I am having problems getting the other equation in terms of y, and I'm not even sure one can do so! If this is the case, how should I approach solving this problem? Thanks for any replies.