9514 1404 393
Answer:
A: ∠WXZ = 87°; ∠ZXY = 73°
Step-by-step explanation:
Ray XZ divides the angle WXY into parts that have a sum equal to the whole.
(7x-4)° +(5x+8)° = 160° . . . . . whole is sum of parts
12x = 156 . . . . . . . . . . . . . divide by °, subtract 4
x = 13 . . . . . . . . . . . . . . divide by 12
∠WXZ = (7x -4)° = (7·13 -4)° = (91 -4)° = 87° . . . . . matches choice A
