The given function is $f(x) = 7x + 2$.

You are asked to find the value of $f(x)$ when $x = 4$.

To do this, substitute $x = 4$ into the function:

$f(4) = 7(4) + 2$

$f(4) = 28 + 2 = 30$

Thus, the value of $f(x)$ when $x = 4$ is 30.

Would you like more details or have any other questions?

Here are 5 related questions to expand your understanding:

1. What is the general process for evaluating a function at a given $x$-value?
2. How does the slope $7$ in the equation $f(x) = 7x + 2$ affect the graph of the function?
3. What is the value of $f(x)$ when $x = -1$ for the same function?
4. Can you determine the inverse of the function $f(x) = 7x + 2$?
5. How would you graph the linear function $f(x) = 7x + 2$?

Tip: For linear functions like $f(x) = 7x + 2$, the coefficient of $x$ (in this case, 7) represents the slope, and the constant term (2) represents the y-intercept.