Given the functions:

• $f(x) = x^2 + 5x + 6$
• $h(x)$ (not yet provided)

We can start by calculating $f(4)$:

$f(4) = 4^2 + 5(4) + 6$

Let's calculate this:

$f(4) = 16 + 20 + 6 = 42$

So, $f(4) = 42$.

Now, to complete the calculation of $(h \circ f)(4)$, we need the function $h(x)$. Could you please provide the expression for $h(x)$?