Respuesta :

Medunno13

Answer: 4

Step-by-step explanation:

Sides opposite congruent angles in a triangle are congruent, so:

  • 4x = x + 3
  • 3x = 3 [subtract x from both sides]
  • x = 1 [divide both sides by 3]

So, MN = 1 + 3 = 4