12.1#10

I don't know what I am doing wrong with this one.

I tried using iterated integrals, I tried doing the point thing. Neither worked. 

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You do need to use iterated integrals--since the region is a rectangle the limits of integration will be constants--which makes your life easier. It would also make your life a little easier if you would do  the integral with respect to y on inside--if you remember that x is a constant for that y-integral you can use substitution. I can't tell exactly what you did wrong--your answer is only about 30% wrong though.