Question

The graph of a function f(x) is shown below:

What is the domain of f(x)?
a. integers from −1 < x < 2
b. integers from −3 < y ≤ 3
c. integers from −3 ≤ y < 3
d. integers from −1 ≤ x ≤ 2

Answer 1

Count the dots plotted here. There are four of them, right? What are the x-coordinates of those four dots: Answer: {-1, 0, 1, 2}.

Reject answers B and C because none of the four dots have x-coordinate -3.
Reject answer A because this set would not include x=-1 or x=2.