Simplify the expression to a+bi form

Create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)