Question

Can someone help? i am stuck

Answer 1

`\alpha=40^(\circ) \ , \ \beta=(x+20)^(\circ) \ , \ \gamma=(2x-30)^(\circ)\\\\\alpha+\beta+\gamma=180^(\circ)\\\\40^(\circ)+(x+20)^(\circ)+(2x-30)^(\circ)=180^(\circ)\\\\40+x+20+2x-30=180\\\\30+3x=180 \ |-30\\\\3x=150\ | : 3\\\\x=50^(\circ)`


`\beta=70^(\circ)\\\\ \gamma=2*50^(\circ)-30^(\circ)=70^(\circ)`

40+70+70=180