Answer:
x = 18, 2x = 36 , 3x = 54 , 4x = 72
Explanation:
the 4 angles x°, 2x° , 3x° , 4x° lie on a straight line and sum to 180°
sum the 4 angles and equate to 180
x + 2x + 3x + 4x = 180 , that is
10x = 180 ( divide both sides by 10 )
x = 18
Then
x° = 18
2x° = 2 × 18 = 36
3x° = 3 × 18 = 54
4x° = 4 × 18 = 72