Please answer a and b

1. (16 points) Using the disk method, find the volumes of the following solids of revolution: (a) y=x4,x=0,y=1, rotated around the x-axis; (b) y=x1,x=2,y=3, rotated around the x-axis; (c) y=x+11,y=31,y=1, rotated around the y-axis; (d) y=4x,y=x,x=0, rotated around the y-axis