1. **Stating the problem:** We are given the algebraic expression $4 + n$ and asked to evaluate it when $n = 2$. 2. **Understanding the expression:** The expression $4 + n$ means the sum of 4 and a number $n$. The value of $n$ can change, so the expression represents a general sum. 3. **Substitute the value:** When $n = 2$, substitute 2 in place of $n$: $$4 + n = 4 + 2$$ 4. **Calculate the sum:** $$4 + 2 = 6$$ 5. **Conclusion:** The value of the expression $4 + n$ when $n = 2$ is 6. This shows how algebraic expressions work by substituting values for variables and simplifying.