Use the graph of the function to find, f(-6).
A. -3
B. -1
C. 1
D. 3

The correct answer is D. 3.
In order to find this, we go to the graph where x is equal to -6. When we find that point, we go up until we hit the line and then look for the y value. You'll see the y-value when x is equal to -6 is at y = 3