Basic calculus

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Let R be the region enclosed by the curves y =4-x', x + y = 2, and the r-axis, as shown below. (-1,3) + X (-2,0) (2,0) a. Set up a (sum of) definite integral(s) that is equal to the area of R using vertical rectangles. b. Set up a (sum of) definite integral(s) that is equal to the arc length of the portion of the curve y = 4 - x' which serves as a boundary of region R. c. Set up a (sum of) definite integral(s) that is equal to the volume of the solid of revolution generated by rotating R about the line x = 3 using the method of washers