Find the volume V of the solid obtained by rotating the region bounded by the given curves using disk, washer?

Using disc elements dx wide along the x-axis: dV =?. Y². Dx =?.

X?. Dx then V =?.?x?. Dx from x=0 to x=4 V =?.?.

X? Which after inserting limits gives V =?.?.4? 643.4 cubic units.

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