Answer: 15.75°
Explanation:
Supplementary angles simply refers to the angles that add up to 180°. The angles given in this case are 54° and 8x.
To find the value of x goes thus:
54° + 8x = 180°
8x = 180° - 54°
8x = 126°
x = 126°/8
x = 15.75°
Therefore the value of x is 15.75°