Respuesta :

9514 1404 393

Answer:

  x = 8.5

Step-by-step explanation:

The given angles are complementary, so ...

  (4x -8) +(6x +13) = 90

  10x +5 = 90 . . . collect terms

  10x = 85 . . . subtract 5

  x = 8.5 . . . . divide by 10