Rotating y=xy = xy=x, 0≤x≤30 \le x \le 30≤x≤3 about the xxx-axis. Volume isA27π27\pi27πB3π3\pi3πC9π9\pi9πcheck_circleDπ\piπExplanationV=π∫03x2 dx=π⋅9=9πV = \pi\int_0^3 x^2\,dx = \pi \cdot 9 = 9\piV=π∫03x2dx=π⋅9=9π.