3. ricardo is enrolled in a video-game rental program. in the program, a certain number of rentals are free, and then a fee is charged for each rental. the fee for each rental is the same. the expression 3(r – 5) represents the total ricardo has paid for his rentals so far. the number of games he has rented so far is unknown. a. what does the first factor in the expression represent? explain how you know. b. what does the variable r in the second factor represent? explain how you know. c. what does the number 5 in the second factor represent? explain how you know.