Plz don't understand what there asking

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

Which of the following is the true for f(x) = 5cos

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation