Simplify the following polynomial expression. (5x^4 – 9x3 + 7x– 1) + (-8x4 + 4x2 – 3x + 2) - (-4x3 + 5x – 1)(2x – 7)​

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