Caitlin has a movie rental card worth $85. after she rents the first movie, the card's value is $82.25. after she rents the second movie, its value is $79.50. after she rents the third movie, its value is $76.75. assuming the pattern continues, which function defines a(n), the amount of money on the rental card after n rentals? a(n)=85n-2.75 a(n)=85-2.75n a(n)=2.75n-85 a(n)=2.75-85n