D is the answer because all you have to do is solve
Step-by-step explanation:
9x - 2 = 4x + 8 → (9-4)x = 8 + 2 → 5x = 10 → x = 10/2 = 5
C. multiplication
Multiplication not used
Answer:
no
Step-by-step explanation:
sum of angles=74.5+87.1+23=184.6°≠180°