ALGEBRA FUNCTIONS PLEASE HELP ME, ITS DUE IN 1 HOUR

questions:

1) What is f(27) and what does it represent in the context of the problem?

2) What is the range of the function?

3) After how many minutes will the number of units of insulin in the bloodstream be less than one quarter of it's original amount? Explain your solution.

4. Estimate the rate of change between x = 0 and x = 9
Compare that with the rate of change between x = 0 and x = 24

ps: use the graph to answer these and thank you so much!