If m∠ QOS=58, m∠ POR=61, and m∠ POQ=22 what is m∠ ROS
QOR= 61-22
ROS= 58-QOR
Let ROS=a, QOR=b, POQ=c. We have c=22, b+c=61 --> b+22=61 --> b=39, a+b=58 --> a+39=58 --> a=19.
+605 
