To find $f(x)$ when $x = 30$, we can substitute $x = 30$ into the given function:

$f(x) = 2x + 1$

Substituting $x = 30$:

$f(30) = 2(30) + 1 = 60 + 1 = 61$

So, $f(30) = 61$.

Would you like more details or have any questions?

Here are 5 related questions for you to explore:

1. What would $f(x)$ be if $x = -5$?
2. How would the function change if it were $f(x) = 3x + 1$?
3. Can you find the inverse of the function $f(x) = 2x + 1$?
4. What is the slope of the function $f(x) = 2x + 1$?
5. How would you graph $f(x) = 2x + 1$?

Tip: When evaluating a function, always substitute the variable with the given value and follow the order of operations.