Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Draw a typical approximating rectangle and label its height and width. Then find the area S of the region. (Give an exact answer.)

1) y=x^2 ,4x-3x^2
2) 3x+y^2=13 , x= 4y
3) y= absolute value for 4x , y= x^2-5

cristo
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