12) A pilot rents a small plane at a local airport. The airport charges a flat fee of $200, which includes up to one hour rental. Following the first hour, a rate of $100 per hour is charged. Furthermore, the airport offers a 5% discount on rentals for 3 hours or more. Determine a piecewise function to model the cost of renting the plane. (1- 4 marks) 13) Determine the symmetry (even, odd or neither) of the function f(x) =x* + 3x] -7. (1- 2 marks)