Can someone help me i dont know what to do here please Explain and answer

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

Which of the following describes the symmetry of the graph of y = x3?