3x=9 find the equivalent equation

Plz need answer now will mark which situations represent linear functions? check all that apply. a)the temperature rises and falls over the course of a day. temperature is a function of time. b)a baseball is hit into the outfield. the height of the ball is a function of time. c)a car goes 55 mph on the highway. distance is a function of time. d)a child grew 2 inches this year and 1 inch last year. height is a function of time. e)a movie director makes 2 movies per year. the number of movies is a function of the years.

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?