To find the number of boxes Trina sold, we can set up the equation based on the information given.
Yuri sold 14 boxes, and together they sold a total of 37 boxes. Therefore, the equation should represent the total number of boxes sold, combining both Yuri's and Trina's sales:
\[ n + 14 = 37 \]
This means that Trina sold \( n \) boxes.
Now, to solve for \( n \):
- Subtract 14 from both sides of the equation: \[ n = 37 - 14 \]
- This simplifies to: \[ n = 23 \]
Thus, Trina sold 23 boxes.
The correct response from your options is: n + 14 = 37; Trina sold 23 boxes.