Please help this is urgent solve all of them I don't get it

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.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12