Isabelle bought a car for 25000. she took out a loan that charges an annual rate of 4.5%. Isabelle also owes $500 for having an automatic car starter installed, which was at no interest. Assume Isabelle doesn't make any payments. Write an exponential function f(t) to represent the amount Isabelle owes on her car after t time, where t is the number of years,. write a function g(t) to represent the amount Isabelle owes for her car stater after t years. Find (f+g)(t) and explain what this function represents.