To solve for the number of boxes Trina sold, we can set up the equation based on the information given. We know that:
- Yuri sold 14 boxes.
- Trina sold \( n \) boxes.
- Together, they sold a total of 37 boxes.
The equation representing the situation is:
\[ n + 14 = 37 \]
To find \( n \), we can subtract 14 from both sides:
\[ n = 37 - 14 \] \[ n = 23 \]
Thus, Trina sold 23 boxes.
The correct response is: n + 14 = 37; Trina sold 23 boxes.