Answer:
121°
Step-by-step explanation:
The sum of the a triangle's angles is 180°
so the missing angle: 180°-(87°+34°) = 59°
so z°= 180°-59°= 121°
121º
Once interior angles of a triangle sum 180º, the remaining angle is:
34º + 87º + x = 180º
x = 59º
Once ∠x and ∠z are supplementary angles (add up to 180º), ∠z = 121º
