Help, I suck at math ;-;

Find the value of x for which line a is parallel to line b

State one method by which you can recognize a perfect square trinomial.

The statements below can be used to prove that the triangles are similar. ? △abc ~ △xyz by the sss similarity theorem. which mathematical statement is missing? ∠b ≅ ∠y ∠b ≅ ∠z