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Let R be the region bounded by the following curves. Find the volume of the solid generated when R is revolved about the y-axis. y = x, y = 7x, y = 21 The volume of the solid is cubic units. (Type an exact answer.)

Let R be the region bounded by the following curves. Find the volume of the solid generated when R is revolved about the y-axis. y = x, y = 7x, y = 21 The volume of the solid is cubic units. (Type an exact answer.)

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Let R be the region bounded by the following curves. Find the volume of the solid generated when R is revolved about the y -axis.
y = x , y = 7 x , y = 21
The volume of the solid is ◻ cubic units. (Type an exact answer.)

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