Answer:
D
Step-by-step explanation: The two angles are not equal. The alternate interior angles theorem states that if the alternate interior angles are equal when a pair of lines is cut by a transversal, the two lines are parallel. However, the two angles are not parallel, so the lines are not parallel.
The answer (I believe) Is 6.
bc you do this...
x+(5x-6)+(5x-6)=54
then solve
Answer:X=9
Step-by-step explanation:
x+18=3x
18=2x
x=9