I need to know if the following pairs of expressions are equivalent!

10a - 7a and 5a + 2a - 4a

9 - 4y and 4y - 9

6 + s and 6s

2c + 6c + 9 - c - 4 and 7c + 5

Television viewing reached a new high when the global information and measurement company reported a mean daily viewing time of 8.35 hours per household. use a normal probability distribution with a standard deviation of 2.5 hours to answer the following questions about daily television viewing per household. a. what is the probability that a household views television between 4 and 10 hours a day? (to 4 decimals) b. how many hours of television viewing must a household have in order to be in the top 7% of all television viewing household? (to 2 decimals) c. what is the probability that a household views television more than 4 hours a day? (to 4 decimals)