What is the volume created by rotating the region between the curve
y = px+ 1 and the x-axis from
x = 1 to x = 3 about the line y = 2?
(I just need the set up for the integral, not the answer)

Question

anonymous · Answer

since you're rotating around the line y=2, subtract 2 from the equation so y=px. Then you can proceed to rotate the function as you would if it were about the x axis.

turingtest · Answer

usually a nice idea to draw a pic

turingtest · Answer

|dw:1380668940646:dw|

turingtest · Answer

after rotation would look something like...

turingtest · Answer

|dw:1380669094385:dw|

turingtest · Answer

nevermind you don't need the intersection; you are given the bounds of x
so now you probably want to use disk method. What is the radius of each disk?|dw:1380669389202:dw|