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OpenStudy (anonymous):
A region is bounded by y = 3x, x-axis and x=5. What is the volume of this region revolved about the y axis?
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OpenStudy (irishboy123):
this is a cylinder minus a cone, or you can do some calculus (volume of revolution) but why would you bother...
OpenStudy (irishboy123):
but whatever you're doing, first draw it out. that usually really helps.
OpenStudy (anonymous):
oh, yes, drawing it out does help a lot. Thanks for the pointer!
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