Respuesta :

angstar4
The angles in a triangle add to 180

6x + 13 + 6x + 4 + 79 = 180
12x + 96 = 180
12x = 84
x = 7

Plug back in
6(7) + 13
42 + 13
55

The angle looks acute

Double check
6(7) + 4
42 + 4
46

46 + 55 + 79 = 180!