Which of the following eight expressions does not belong in the list? You may explore with numbers, but your final explanation MUST show the simplified variable expressions. a − b + c c − b + a c − (b − a) −b + a + c c +a − b a − (b − c) b − (c − a) a + c − b

Can someone me with this problem i don't understand i need

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.