The math club decided to have a car wash to raise money for competition expenses. The graph below shows the relationship between cars washed and earnings (in dollars). Describe the domain of the graphed function as precisely as possible.
_{-20, -15, -10, 0, 5, 10, 15, 20, 25, 30, 35, 40}

_{0, 1, 2, 3, 5, 6, 7, 9, 10, 11, 12}

_0 < x < 12

_-20 < x < 40