IDNLearn.com: Where your questions meet expert answers and community support. Ask your questions and get detailed, reliable answers from our community of experienced experts.
Answer:
57
Step-by-step explanation:
exterior angles add up to 360 so'
9x+1+5x+12+10x-37
24x-24=360
24x=384
x=16
10(16)-37
160-37
123
180-123
= 57