MATH
posted by Anonymous .
a rule of thumb used by car dealers is that the trade in value of a car decreases by 20% of its value each year. suppose the initial value of your car is $23,500. write an equation expressing the trade in value of your car as a function of the number of years from now. if your car is really 2.7 years old now, what was its trade in value when it was new?

I don't know I need help