Answer:
x = 72
Step-by-step explanation:
By exterior angle theorem:
x° + (x + 10)° = 154°
(x + 10 + x) ° = 154°
(2x + 10)° = 154°
2x + 10 = 154
2x = 154 - 10
2x = 144
x = 144/2
