Answer:
1. 360÷6=60
x=60°
2. 120+75+115=310
360÷310=50
x=50°
3. 360÷9=40
180-40=140
x=140°
4. 540-400=140
5. 140+150+130+90+90=600
720-600=120
x=120°
I hope it helps:)