Given: X = 35^, Y = 65^.

Question 10: In triangle XYZ.
Given: $\angle X = 35^\circ$, $\angle Y = 65^\circ$.
From the diagram, side XZ = 8 cm. This is the side opposite angle Y.
Assumption: I am assuming the diagram's label of 8 cm for side XZ is correct, and the text "Side opposite X = 8 cm" is a typo.

a) Find angle Z.

Step 1: The sum of angles in a triangle is $180^\circ$.

$$\angle Z = 180^\circ - \angle X - \angle Y$$ $$$$