Negative 20 and three-fourths degrees.

2 and a half degrees

40 & 50 in the right corner are the complementary angles as when placed in a sum (added together) they make 90°

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.