Given the function $h(x) = 4x + 3$, we want to find $h(4)$.

Step 1: Substitute $x = 4$ into the function

Substituting $x = 4$ in the function:

$h(4) = 4 \cdot 4 + 3$

Step 2: Simplify the expression

Now, simplify the right-hand side:

$h(4) = 16 + 3 = 19$

Therefore, the value of $h(4)$ is:

$\boxed{19}$

Would you like a detailed explanation of each step, or do you have any questions?

Here are 5 related questions to expand your understanding:

1. What is the inverse of the function $h(x) = 4x + 3$?
2. How would you find $h(h(x))$?
3. If $h(x) = 4x + 3$, what is $h(-2)$?
4. How would you determine if $h(x) = 4x + 3$ is a one-to-one function?
5. How would you graph the function $h(x) = 4x + 3$?

Tip: For any function $f(x)$, finding $f(a)$ involves substituting $a$ into the function and simplifying the result.