I need these answers for a worksheet I have and I would appreciate it if someone would help me out. Question 1. You can combine like terms to an expression.

Question 2. All are like terms and can be combined.

Question 3. Terms with the same are considered like terms.
Answer choices:
Constants

variables

simplify

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