Part I: For each of the following. Sketch the graph for the base and draw a line segment indicating the base of a cross section. Write a function for the area of each cross section. Set up the formula for the volume of the solid. 1. The base of a solid is the region enclosed by the graph of x + 4y = 4. Cross sections of the solid perpendicular to the x-axis are squares. Write an integral that represents the volume of the solid 2. The base of a solid is the region enclosed by y=e, the x-axis, the y-axis and the line x = In 3. Cross sections perpendicular to the x-axis are squares. Write an integral that represents the volume of the solid 3. The base of a solid is the region enclosed by y=e", the lines y-1 and x = In 3 Cross sections perpendicular to the y-axis are squares. Write an integral that represents the volume of the solid.