The solution to the equation $3 + 1$ is:

$3 + 1 = 4$

Would you like more details or have any other questions?

Here are 5 more questions you might consider asking:

1. What is the derivative of $x^2$?
2. How do you solve a quadratic equation?
3. What is the integral of $\sin(x)$?
4. Can you explain the Pythagorean theorem?
5. How do you find the area of a circle?

Tip: When solving simple addition problems, ensure all numbers are accurately identified to avoid calculation errors.