Simplify the rational expression. state any restrictions on the variable.

a. t + 4; t ≠ 8 b. - t + 4; t ≠ - 8 c. t - 4; t ≠ - 8 d. - t - 4; t ≠ 8

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