A car rental costs $50 for the first day. Additional days cost $35 per day, unless the car is rented for 7 days or more, in whic
h 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