Answer:
C is your answer
Step-by-step explanation:
28 : 12
or in reduced form
7 : 3
Angle BCA = 180 - 100
angle BCA = 80
Isosceles triangle ABC has two congruent angles, A and B
2x + 80 = 180
2x = 100
Angles A and B = 50 or y and z = 50
I think lines AB and DE are supposed to be parallel, so angles y and x are consecutive interior angles (supplementary)
x = 180 - 50 = 130
Using the formula y=200+50x, plug in x=1 to get y=250.
