4. A 3D solid has base that sits in the x-y coordinate plane. That base is a triangle with vertices (4, 0), (-4, 0), (0, 8). Cross sections perpendicular to the y-axis are semi-circles with diameter in the plane. The volume of the solid is given by A. , 7(8 – 2x) dx B.,(2x + 8)2 + S(8 – 2x) dx c. f (8 - y) dy D. (8 - y)? dy E. (8 – y)? dy -8 T

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