Answer: B and C.
To solve this question you must know what f(x) means. The function of x, or f(x) is basically what y equals for the value of x.
When x = 15, y = 8. You can also write that out by saying, f(15) = 8. Using that logic, C is also correct.
A is not correct since the domain means all values of x. The domain of this chart is {0, 5, 10, 15, 20, 25, 30, 35, 40}, not {5, 6, 7, 8, 9, 10, 11, 12, 13}, which is the range or all the values of y.
D is also not the correct answer since the range for f(x) doesn't go on forever (since the chart isn't that long :-)).
Therefore your answers are B and C.
