A Calculator is required for this problem. O R Let R be the region enclosed by the x-axis and the graphs of y=x4-2.3x³+4 and the horizontal line y=4 as shown in the figure above. (a) Find the area of R. (b) The base of a solid is region R. Each cross section of the solid perpendicular to the x-axis is a semicircle whose diameter lies in the xy-plane. Write an expression involving one or more integrals that gives the volume of the solid. (c) The vertical line x=k divides region R into two equal areas. Write, but do not solve, an equation involving one or more integrals in terms of k. (d) Find the volume of the solid generated when R is revolved about the horizontal line y=-2.

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