Respuesta :

Answer:

74°

Step-by-step explanation:

m(arc)JKL = 2 × 99° = 198°

8x - 6 + 12x + 4 = 198

20x - 2 = 198

20x = 200

x = 10

m(arc)KJ = 8x - 6 = 8(10) - 6 = 74°