Answer:
∠N° = 19°
∠M° = 35°
∠L° = 126°
Explanation:
Total angle in a triangle: 180°
∠N° = x°
∠M° = ( 2x - 3 )°
∠L° = ( 7x - 7 )°
180 = N + M + L
180 = x + 2x - 3 + 7x - 7
180 = 10x - 10
10x = 180 + 10
10x = 190
Divide both side by 10
x = 19
∠N° = x° = 19°
∠M° = ( 2x - 3 )° = ( 2(19) - 3 )° = 35°
∠L° = ( 7x - 7 )° = ( 7(19) - 7 )° = 126°