First picture is by itself. Next is graph problem :)

1). g(-9) = -81.914

2). Last option

Step-by-step explanation:

1). f(x) = x²

   For x = -9

   f(-9) = (-9)² = 81

   g(x) =

   g(-9) =

           =

           = -    

   (g - f)(-9) = g(-9) - f(-9)

                  =

                  =

                  =

                  = -81.914

2). The relation is not a function because this function doesn't passes a vertical line test.

Last option will be the answer.