#### Answer

$4$

#### Work Step by Step

RECALL:
$f(a)$ represents the value of the function, $f$ ,when $x=a$.
Thus, $f(4)$ means that we find the value of the function when $x=4$.
Using the graph, we find that when $x=4$, $y=4$.

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Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$4$

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