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Math Help - volume: figuring out integration values.

  1. #1
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    volume: figuring out integration values.

    If i have the graph of the following functions y=ln7x,y=0 and x=5.

    If I want to find the volume for x=-1, how would I figure out the values [a,b] of the integral. I know that this is a washer formula, but that is irrelevant.

    What if I wanted to find the volume for y=5? What are the integration values now?
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  2. #2
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    Ok well I checked my notes and for x=-1 the integral goes from 0 to ln35. I just do not see how that is.
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