We are given the function $f(x) = 3 - \frac{x}{2}$, and we are asked to calculate the value of $f(4)$.

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

$f(4) = 3 - \frac{4}{2}$

Simplifying:

$f(4) = 3 - 2 = 1$

Thus, the correct value of $f(4)$ is 1, which corresponds to option C.

Would you like more details on this? Here are five related questions:

1. How would you calculate $f(x)$ for any arbitrary value of $x$?
2. What happens to the value of $f(x)$ as $x$ increases?
3. How do you graph a linear function like $f(x) = 3 - \frac{x}{2}$?
4. What is the slope of the function $f(x) = 3 - \frac{x}{2}$?
5. How would you solve $f(x) = 0$ for $x$?

Tip: When solving for a function value, always carefully substitute and simplify step by step to avoid errors.