- Easy Calculus Problem help!?

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Can anybody tell me what's the Chaos Theory math equation? Find the indicated limit, if it exists. lim f(x), x approaches 9 {x+9 , x < 9} { 27-x , x>9}? How do you do this math question?
http://prntscr.com/8xzwq7? Find the area of the region between the curves x=1−y2 and x=y2−1. I'm a little confused because of the x= not y= and still can't figure it!? Domain: -1, 5, 5, 6
Range: 2, 3, 3, 7
Is this a function?