Sure I'll help.
1. It is correct. (C sq. - B sq. = A sq.)
2. Correct (A sq. + B sq. = C sq.)
3. Correct (Easy by just guess and check)
4. Correct, I helped with that one. but it is just (A sq. + B sq. = C sq.)
5. Correct, I helped, (C sq. - B sq. = A sq.)
Yep, you got them all correct!