Explain step by step and solve number 16 and 18

13-18 . The region enclosed by the given curves is rotated about the specified line. Find the volume of the resulting solid. 13. y = 1/x, x = 1, x = 2, y = 0; about the x-axis 14. x = 2y - y2. ", x = 0; about the y-axis 15. x - y = 1, y = x2 - 4x + 3; about y = 3 16. x = y', x = 1; about x = 1 17. y =x , y = Vx; about x = 1 18. y = x', y = Vx; about y = 1