# Double/Triple/Iterated Integrals and Max/Min

Hi people, I have a midterm for calculus coming up, so I was wondering if you guys could give me some interesting problems regarding double/triple/iterated integrals with change of variables, and max/min.

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2) Find the integral $$I = \iint_R 21y dx dy$$ where R is the region above the x-axis and bounded by $$y^2 = 4 -4x$$ and $$y^2 = 4 +4x$$. (I would use a jacobian.)