(4) The shaded region R is enclosed by the curve y = 2vx - 1 and the line y = x-1. 3 2 X 0 W 4 Find volume of the solid of revolution by rotating region R (i) About the x-axis; About the y-axis; (iii) About the vertical line x = -1; (iv) About the horizontal line y = 4. Hint: Use either the Washer or the Shell Method