text: more calc 2 help: volume of solid obtained by...? this is a badly failed test im obsessed with correcting. a brass horn is obtained by revolving the region between y=3/x and y=2/x and x=1 and x=20 around the x-axis. please tell the set up and answer. i got 19pi/4 using the washer method:  v = pi * integral (3/x)^2 - (2/x)^2 dx  which does give the answer 19pi/4