15 ! geometry questions attached!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Which of the following can be used to explain a statement in a geometric proof?

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte