Respuesta :

Answer:

  • 77°

Step-by-step explanation:

  • m∠QDC = 1/2(mQB + mBC)
  • 5x + 17= 1/2( 4x - 6 + 9x + 4)
  • 10x + 34 = 13x - 2
  • 13x - 10x = 34 + 2
  • 3x = 36
  • x = 12

m∠QDC = 5*12 + 17 = 77