Respuesta :

Step-by-step explanation:

  • (9z+7)°+74°=180°
  • 9z°+7°+74°=180°
  • 9z°+81°=180
  • 9z°=180°-81°
  • 9z°=99°
  • z=99°/9°
  • z=11°
180-74 because together they equal 180 as they’re on a straight line
=106

106-7
=99

99 divided by 9
=11

z=11