1. 28 + 28 + x = 180
54 + x = 180 54 - 54 + x = 180 - 54 x = 126
54 + x = 180
54 - 54 + x = 180 - 54
x = 126
2. 110 + 30 + x = 180
140 + x = 180 x = 40
140 + x = 180
x = 40
3. 90 + 25 + x = 180
x = 65
4. x= 134
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