After simplifying, which expressions are equivalent? Select three options. (3.4a – 1.7b) + (2.5a – 3.9b) (2.5a + 1.6b) + (3.4a + 4b) (–3.9b + a) + (–1.7b + 4.9a) –0.4b + (6b – 5.9a) 5.9a – 5.6b

State one method by which you can recognize a perfect square trinomial.

Explain how the quotient of powers was used to simplify this expression.

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?