I am giving 100 points and brainleist if u can help me with this problem please I dont get it

Find the quotient. 50a2 – 98b2 -5a +7b

Solve for x and select the correct answer

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