I'm only answering because the app told me i need to help someone before I can ask another question, but I can't help because I don't know what to help you with so
Answer:
B. 60-60-60
Step-by-step explanation:
The interior angles of a triangle must add up to 180 degrees. The only set of numbers adding up to 180 is choice B.
You said x=-7 and Y=2? if so then 7(2)--7= 21