Evaluate b – 2a – c for a = –3, b = 9, and c = –6.

b – 2a – c
= 9 - 2(-3) - (-6)
= 9 + 6 + 6
= 21

answer
21

In the first triangle 80+20+p=180 (since sum of all angles of a triangle is 180)so p= 80also in second triangle 55+45+q=180 (since sum of all angles of a triangle is 180)so q=80so we can conclude that p=80 degrees q=80 degrees so p=q=80 degreeshence option b is correct

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