A composite function combines two or more functions to generate a new function.
<em>The value of </em>
<em> is -2</em>
The require parameter is:

First, we calculate f(6)
From the graph (see attachment)

So, the function
becomes:

In other words,

Next, we calculate f(2)
From the graph

So:

Hence, the value of
is -2
Read more about composite functions at:
brainly.com/question/20379727