Hi,

  .

X = (4a- 40)°   and  Z = (2a - 8)°

Question States***

X + Z + X + Z = 360 |Opposite angles Equal

2(4a-40) + 2(2a-8) = 360  |Opposite angles Equal

12a = 360 + 80 + 16

a = 38

the angles of the parallelogram are: = 112° and 68°  

CHECKING our answer***

2*112 + 2*68=  = 224 + 136 = 360 

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