Respuesta :

Medunno13

Answer:

71°

Step-by-step explanation:

  • 84+(2x-1)+(x+8)+(x+5)=360 [angles in a quadrilateral add to 360°]
  • 4x+96=360 [combine like terms]
  • 4x=264 [subtract 96 from both sides]
  • x=66 [divide both sides by 4]

So, angle A measures 66+5=71°