Hello, can someone provide a step by step process for question#36 that determines the volume thank you

Questions 35 through 42 refer to the following: Determine the volume of the solid whose base is bounded by the graphs of the given equations and having each cross-section perpendicular to the x-axis of the indicated shape. 35) y=9-x2, y = 0, square 36) y=2x, y=4x, square