use the graph of f to find the value f(4).

Explanation:

Step1: Locate the x-value on the graph.

To find $f(4)$, we need to find the point on the graph where the x-coordinate is 4.

Step2: Determine the y-value.

Looking at the graph, when $x=4$, the graph of $y=f(x)$ passes through the y-value of 0.

Answer:

$f(4) = 0$