Answer:
its D
Step-by-step explanation:
C= n d
If vertical angles are congruent you know
84=4x
21=x
You also know that angle M is supplementary to the angle
, measuring 84. Supplementary means it adds to 180 so if you take the difference you get
180-84=M
96=M
Also M is vertical to the last unknown angle so since vertical angles are congruent the last angle is also 96
