To find [tex]f(3)[/tex], we find the output when 3 is the input. By this, I mean we try to find the y when x is 3. We see that on the graph, when x is 3, y is 8. Be mindful of the scale on the y-axis, where every unit is 2, not 1.
In sum, [tex]f(3)=8[/tex], or D.
