Answer:
y = 102, z = 70
Explanation:
z and 110 are adjacent angles and supplementary, sum to 180° , so
z = 180 - 110 = 70
The sum of the interior angles of a quadrilateral = 360°
sum the given angles and equate to 360
99 + 89 + 70 + y = 360, that is
258 + y = 360 ( subtract 258 from both sides )
y = 102