1) all the angles opposite the vertex are the same, therefore te ngle w opposite to 110 ° is equal, then
you have y° = 180 -(110°+30°) = 180°-140° = 40°,
as the line AB is parallel to CD them W Y Z are angles alternes and interns then Z = W, Z = 110
NOW X+Y+Z =180°
X+Z+30 = 180
X+110+30 = 180
X= 180-130 = 40
