Answer:
x = -11°
Step-by-step explanation:
The triangle given is right angle triangle which has 90°
The total interior angle of a triangle is 180°
Solve:
x + 31° + 90° + 70° = 180°
x + 191° = 180°
x = 180° - 191°
x = -11°
Therefore, the value of x is - 11 degrees.