Which set of ordered pairs does not represent a function? 1-{(5,−2),(−6,−4),(−2,3),(−1,−4)}
2-{(−3,4),(−8,0),(3,−8),(−3,−4)}

3-{(6,3),(−1,5),(−7,3),(3,0)}

4-{(3,9),(2,7),(9,9),(4,−3)}

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. y= 5x, y=7x^2then find the area s of the region.