Use the values in the following table.

1. (a) Explain why the table defines y as a function of x.
(b) State the domain and range of this function.
(c) If the table expresses y = f (x), find f(0) and f(11).
2. (a) If the function defined by the table is denoted by f, so that y = f (x), is f(9) an input or an output of f?
(b) Does the table describe x as a function of y? Explain.

9 11 4.2 18 22 -7 -1 0 14 -1 0 0 1 5 9 11 35 9. 22 22 y 60