In the following problems, find the mean value of the given function over the specified region R. fx,y=3y; R is the triangle with vertex (0,0), (4,0) and (2,2). fx,y=x; R is the region bounded by y=4-x2 and the x-axis. fx,y=exy-12; R is the region of the first quadrant bounded by y=x2, x=0 and y=1.

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