Answer:
4a) ∠x = 28°
∠y = 104°
∠z = 104°
4b) I don't understand what the question is.
Explanation:
∠x = 28° because it is alternate interior to 28°
∠QRP = ∠RQP because ΔPQR is an isosceles triangle
∠QRP = (180 - 28)/2 = 76°
y = 180 - 76 = 104°
∠z = ∠y because they are alternate exterior angles
∠z = 104°