Respuesta :

Answer:

z=7

Step-by-step explanation:

72°+(8z-8)°+(9z-3)°=180° (a triangle contains 180° and vertical angles are equal)

(8z-8)°+(9z-3)°=180°-72°

17z°-11°=108°

17z°=108°+11°

17z°=119°

z°=119°/17°

z°=7°

z=7