Let R be the "triangular " region in the plane bounded by the graph of y = e the yraxis, and the Line y'= e 1 Compute the area of R . 2 use the disk / washer method to compute the volume of the solid of revolution obtained when R Is revolved about the x-ax's (31 Use the cylindrical shell method to compute the volume of the solid of revolution obtained when R is revolved about the line X = -1