In the diagram below, OPis circumscribed about quadrilateral ABCD. What is
the value of x?

9514 1404 393
Answer:
C. 82
Step-by-step explanation:
Opposite angles of an inscribed quadrilateral are supplementary. So ...
(x + 10°) + 88° = 180°
x = 180° -98°
x = 82°