2: 3 and 13:
how do i find the missing ratio?

What is the inverse of the function below? f(x)=x/3-2

Ms.lopez has 4 liters of chemicals that she is going to pour into beakers. each beaker will have 1/4 of a liter of chemicals, how many beakers can ms.lopez fill? draw a model to support your work. (it's ok if you dont)

Me because i don't understand how to do it.: )