Answer:
The answer is C.
Step-by-step explanation:
angle 5 and 4 makes a line which is 180 and since angle 5 equals 57 , 180-57=123.
Let's break it down quick
since (8*5) is in parenthesis, you have to do it first which would equal 40. 10*2=20*8 is 160. Since there is a negative in between that and 3*40 you must solve 3*40 first, which equals 120. Now,
160-120= 40
The answer to the question is 40.
60 would be the interior angle of angle 3 however angle 3 is the exterior angle so it is 360-60=300