Quadrilateral ABCD is inscribed in circle O, as shown below.
75°
80°
(x-10)
D
(y+30)
If mZA -80°, m2B-75°, mzC=(y+30)°, and m2D=(x-10)°, which statement is true? Explain.
(5% of grade)
(1)x 85 and y=50
(3) x
110 and y=75
(2)x 90 and y = 45
(4) x
115 and y = 70


Please show all your work! And EXPLAIN! Look at the attached image!

I think it can either be 3 or 4! Please support your answer!