The expression $4 + (-1)$ simplifies as follows:

$4 + (-1) = 4 - 1 = 3$

So, the result is $3$.

Would you like any more details or have any other questions?

Here are 5 related questions:

1. What is $5 + (-2)$?
2. How would you simplify $7 + (-4)$?
3. What is $8 + (-6)$?
4. Can you evaluate $10 + (-3)$?
5. What is the result of $-4 + 6$?

Tip: Adding a negative number is the same as subtracting the absolute value of that number.