Given the function $f(x) = 3x + 5$, we need to find $f(3)$.

To do this, substitute $x = 3$ into the function:

$f(3) = 3(3) + 5$

$f(3) = 9 + 5$

$f(3) = 14$

Thus, $f(3) = 14$.

Would you like further details or have any questions?

Here are 5 related questions:

1. What is $f(-2)$ for the same function?
2. How do you find the inverse of $f(x) = 3x + 5$?
3. If $f(x) = 3x + 5$, what is $f(a)$ in terms of $a$?
4. How do you graph the function $f(x) = 3x + 5$?
5. What is the slope and y-intercept of $f(x) = 3x + 5$?

Tip: The slope-intercept form $y = mx + b$ is useful for quickly identifying the slope and y-intercept of a linear function.