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Xy=7, x=0, y=7 and y=9 revolves around the x axis
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Xy=7, x=0, y=7 and y=9 revolves around the x axis

User Scott Rice
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With shells, the volume is given by


2\pi\displaystyle\int_7^9\frac7y* y=14\pi\int_7^9\mathrm dy=28\pi
User Cause Chung
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