Respuesta :
The answer will be 1 and if you want to find m. Here is the step:
4m+4m+7m=180°
15m=180°
Divided 15 from both side
m=12°. Hope it help!
4m+4m+7m=180°
15m=180°
Divided 15 from both side
m=12°. Hope it help!