please explain the steps to solve. thanks :)

9. (10 points) Given below is the graph of a rational function r(x) . Determine the formula for r(x) an explain your reasoning. -2 2 -2+ 10. (4 points) Circle each function below which is a rational function: (a) f ( x ) = 2-x (b) g(x) = Xx -5x x+1 2x3 -3 (c) h(x) =17x-4 (d) k(x) = Vn (e) m(x) = Vx-x+ (f) p(x) =17x' -12x3 +19 x+x 2517x -12x- +8 11. (4 points) Use algebra techniques to find the domain of the function r(x) = 2x -7x'-4x