Respuesta :

Answer: x > 74

Step-by-step explanation:

An obtuse angle is greater than 180°.  So, 3x - 42 must be greater than 180.

  • 3x - 42 > 180
  •      +42   +42
  • 3x         > 222
  • ÷3              ÷3
  •   x         > 74