Answer:
75
Explanation:
In a quadrilateral, all 4 interior (inside) angles add up to 360.
Opposite angles are equal. So angle w and angle y are the same. We'll call them both w for the equation.
So 105+105+w+w= 360
210 +2w=360
2w = 150
w = 75
Another way to approach this is that angle z and angle w together = 180. So 180-105 = 75.