Answer:
C [18] degrees
Step-by-step explanation:
⇒ Vertical angles are angles that are opposite each other and formed by two intersecting lines. In short, Vertical angles are congruent.
⇒ Supplementary Angles are angles of which sum is 180 °
( 2x + 5 ) + ( 8x - 5) = 180
2x + 8x = 180
10x = 180
10x/10 = 180/10
x = 18 °
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