Answer:
[tex]25^{\circ}[/tex]
Step-by-step explanation:
The sum of the interior angles of a triangle is equal to 180 degrees, and each side of a straight line is equal to 180 degrees. Therefore, the exterior angle labelled [tex]150^{\circ}[/tex] must be equal to the sum of the two angles marked [tex]125^{\circ}[/tex] and [tex]?^{\circ}[/tex]:
[tex]125+x=150,\\x=150-125=\boxed{25^{\circ}}[/tex]
Thus, the missing angle is [tex]25^{\circ}[/tex].
