Help needed Asap on calc practice problems

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Two numbers have a sum of -19. one number is x. what expression represents the other number?

Proving the parallelogram diagonal theoremgiven abcd is a parralelogam, diagnals ac and bd intersect at eprove ae is conruent to ce and be is congruent to de