Answer:
x = 36°
Step-by-step explanation:
See attachment
To find the measure of angle a subtract;
360° - 144° - 180° = 36°
To find the measure of angle b subtract;
360° - 72° - 180° = 108°
A triangle equals 180°, so subtract for angle x:
180° - 36° - 108° = 36°
