Answer:
6
Step-by-step explanation:
m《 Q+ m《R +m《S =180 (Angles of a triangle add up to 180 degrees )
8x-17 +19x +4 +5x+1=180
32x-12=180
32x =180+12
32x =192
32X /32=192 /32
x=6
substitute x to angle Q, R and S
mQ=8 (6)-17
=31
mR=19 (6)+4
=118
mS=5 (6)+1
=31
