Help please.. so my teacher gave this extremely hard geometry questionsit clearly. so i'm stucked and confused.. help me with these questions please!without even explaining

as much as possible, please explain so i can do it on my own when it comes to our test.. or if you dont want to answer, just explain it to me so i can answer it on my own..

P.S: I removed numbers 1, 3, 4, 5, 6 and 8 because I already solved their answers.. thanks

2.Can a triangle have angles equal to

a. 55°, 65°, 70°

b. 53°, 64°, 73°

c. 80°, 105°, 5°

7. In (triangle)△DEF, <D, <E and <F -44° (deg), Find <D and <E

thanks guys!

thank you so much.. you don't need to answer all of them.. only if you can.. i need help here.. explain please..