Ateacher places n seats to form the back row of a classroom layout. each successive row contains two fewer seats than the preceding row. find a formula, s(n), for the number of seats used in the layout. (hint: the number of seats in the layout depends on whether n is odd or even.)

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