Plz help!!! I’ll give 10 points to the first person to give me a correct answer...I need to get my grade up before the end of the semester

Answer:
A= 30
B= 60
C= 90
Step-by-step explanation:
A is already shown.
B has a right angle making it 90 degrees.
A triangle is 180 degrees 30+90= 120
180-120=60