Answer:
x = 48°
Explanation:
The 3 angles above the x- axis form a straight angle and sum to 180°
To find the missing angle subtract the sum of the 2 marked angles from 180
missing angle = 180° - (42 + 90)° = 180° - 132° = 48°
the missing angle and x are vertical angles and congruent, hence
x = 48°