To add the expressions \( (4d - 3) + (12d + 4) \), follow these steps:
- Combine like terms.
- Combine the \( d \) terms: \( 4d + 12d = 16d \).
- Combine the constant terms: \( -3 + 4 = 1 \).
Putting it all together, we have:
\[ (4d - 3) + (12d + 4) = 16d + 1 \]
So, the final answer is \( 16d + 1 \).