Explained what our function will be, named my function and the parameters.
Declared my first variable (typeOfCar).
Declared second variable (year) and prompted user to enter what year their car is.
Declared car as a variable to create my ternary.
Created ternary that says if car is american and greater than or equal to 1990 then we can service it. If it doesn't meet these requirements then we can't.