Question

So much math yikes anything helps

Answer 1

Try this option, short explanation is in the attached picture (answer is marked by red).
Answers:
18) perpendicular;
19) parallel;
20) perpendicular;
21) parallel;
22) perpendicular;
23) neither;
24) parallel.

Answer 2

21.) Parallel
22.) Neither
23.) Neither
24.) Parallel