Volume using Integration

1. To rotating around a vertical and horizontal line changes which function is the bigger or smaller radius. X goes with horizontal line. Y goes with vertical. 

2. A washer has two functions, a disk has one function. 

3a. Find the volume of the region bounded by: y=x^2-3x+4, x=2, x=4 and rotated about the x axis

3b. Find the volume of the region bounded by: y=sqrt(x), y=x^2 and roared about x=1