Acar rental costs $50 for the first day. additional days cost $35 per day, unless the car is rented for 7 days or more, in which case there is a 10% discount on the daily rate. identify the expression which represents the cost of renting a car if the car has been rented for more than a week. a.) 45+35x b.) 45+31.5x c.) 50+35x d.) 50+31.5x