1. The problem statement, all variables and given/known data f(x) =e^x and g(x)= ln(x) Find the volume of the solid generated when the region enclosed by the graphs of f and g between x=1/2 and x=1 is revolved about the line y=4 2. Relevant equations v= pi* integral( f(x)^2 - g(x)^2 dx) 3. The attempt at a solution SO for the part about the volume I set up my integral as V= pi* integral ( (4-e^x)^2 - (4- ln(x))^2 dx) from 1/2 to 1 and get around -23. Am I right ? should it be 4-e^x or e^x-4 ?