What is the mean average of 100, 75, 40, 90, 80, 100, 92, 88, 80, 84, 81?

Ihave trouble finding the nth term of a linear sequence

The function f(x) is shown in this graph the function g(x)=6x

Anew movie is released each year for 14 years to go along with a popular book series. each movie is 2 minutes longer than the last to go along with a plot twist. the first movie is 70 minutes long. use an arithmetic series formula to determine the total length of all 14 movies