What is that I don’t know it

Answer:
103⁰
Step-by-step explanation:
180⁰ minus 77⁰ is equal to 103⁰
Answer:
x=103°
Step-by-step explanation:
Since 77° corresponds with the angle below x°, then x° and 77° are supplementary to each other, making x°=180°-77°=103