Answer:
154°
Step-by-step explanation:
m<LOM + m<MON = m<LON and since m<LON is a straight angle the measure of it would be 180°
9x - 91 + 6x + 76 = 180 add like terms
15x - 15 = 180
15x = 195
x = 13
m<MON is 6x + 76 replace x with 13 ➡ 6×13 + 76 = 154°
