Respuesta :

According to the diagram, angles 10 and 14 are supplementary, so they sum 180°.

[tex]\begin{gathered} m\angle10+m\angle14=180 \\ 77+m\angle14=180 \\ m\angle14=180-77 \\ m\angle14=103 \end{gathered}[/tex]

Hence, angle 14 measures 103°.