Answer:
139 degrees
Step-by-step explanation:
A straight angle is a 180 degree angle
<AOB+ <BOC= 180
8x+51+6x-25=180
14x+26=180
14x=154
x=11
m<AOB= 8x+51= 8(11)+51= 88+51= 139
139⁰
As AOC is a straight line ange :
AOB + BOC = 180
8x + 51 + 6x - 25 = 180
14x = 180 - 26
14x = 154
x = 11
AOB = 8(11) + 51 = 88 + 51 = 139⁰
