Here are the answers to your questions:
Question 1: The ________ property states that If a = b then a + c = b + c. Answer: A. addition
Question 2: The _______ property states that If a = b then ac = bc. Answer: B. multiplication
Question 3: Without the details for the second example in the video, I cannot provide an answer for this question. If you can provide the example or details from the video, I'd be happy to help determine the answer!