Answer:
Step-by-step explanation:
Since adjacent angles must sum to 180 angle s must satisfy
s=180-9x-21
s=159-9x
Sonce the sum of a triangles angles must equal 180
159-9x+6x+4+50=180
-3x+213=180
-3x=-33
x=11
angle u is 6x+4=6(11)+4=70 degrees
angle s=159-9x=159-9(11)=60 degrees
