1. The problem is to find the sum of 4 and 8. 2. The formula for addition is $a + b = c$, where $a$ and $b$ are numbers and $c$ is their sum. 3. Applying the formula: $4 + 8 = 12$. 4. This means when you add 4 and 8 together, you get 12. 5. So, the final answer is $12$.