Answer:
Well, we know x has to add up to 180 degrees since a triangle has 180 degrees in it!
63 + 36 = _99__
180 - 99 = 81
81 = x
180 - 81 = 99
99 is z
99 + 13 = 112
180 - 112 = 68
68 is y
Since 13 is an angle measurement. We add to get 180.
68 = y
99 = z
81 = x