Explanation:
Every line = 180 degrees
First subrtact 75 from 180
After that, you have p1, p5, n7, and m3 = 108
Then that gives you the answer to the rest of them
p4 p8 and n6 = 75
Side note: If I were you I would study so that I could actually answer the questions when I'm being called on, but I get it.