Answer:
z = 65°
y= 105°
Explanation:
angle z is adjacent to 115° on a straight line, hence they are supplementary angles, i.e they add up to 180°
hence,
z + 115° = 180°
z = 180° - 115° = 65°
recall that the sum of angles inside a convex quadrilateral always adds up to 360°
i.e z + y + 102° + 88° = 360° (we know z from above)
65 + y +102+88=360
y = 360 -65-102-88 = 105°