Answer:
I dont know what was all that calculation that the guy on top of me did but the correct answer is
B. m\ BOC = 40 ; m\ AOB = 45
your welcome
Explanation:
angle AOC=85
also
angle AOC = angle AOB + Angle BOC
85= 2x+10+4x-15
or, 6x= 90
x=15
BOC=2x+10= 2*15+10=40
angle AOB = 4x-15=4*15-10=5=45
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