Answer:
x = 64
Explanation:
Remark
As all triangles have interior angles added up to 180o , quadrilaterals have interior angles adding up to 360. Think of a square with it's frour rightangles. 4*90 = 360
Givens
W+X+Y+Z = 360
X = 100
Y = 130
Z = 66
W = x
Solution
x + 66 + 130 + 100 = 360
x + 296 = 360
x = 360 - 296
x = 64