Answer:
Angle FAB = 75°
Step-by-step explanation:
13x - 3 = 3x + 2 + 55° ( Exterior angle of a triangle equal the sum of the two opposite interior angles)
13x - 3x = 57 + 3 = 60
10x = 60°
Divide both sides by 10
x = 6
Therefore,
Angle FAB = 13x - 3 = 13(6) - 3 = 78 - 3 = 75°
Angle FAB = 75°