there's alot of truth here. as soon as you start to judge others, you end up judging yourself even more. the people who go around criticizing others usually have the lowest self esteem of all.
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i'm assuming you don't know about www.wolframalpha.com but you can enter limits, integrals etc
just make sure you learn the material cause you can't use it on a test...
you almost got it in the last step, the mistake you made was that you brought an x out with the 5 in the right term (only 15x has an x, not 10) (and then you left an x in anyway, not sure if that was...