Answer: X=19
Step-by-step explanation:
Add up everything and set it to 180 degrees so (5x+4)+(x-2)+(3x+7)=180
next 9x+9=180
then 9x=171
x=19
If you want to check by pluggin in value for x for all angles and it should equal 180 added up
Angle POS= 99
Angle SOR= 17
Angle ROQ= 64
99+17+64=180 degrees
