Marissa bought x shirts that cost $19. 99 each and y pairs of shorts that cost $14. 99 each. The next day she went back to the store and bought 3 more shirts that cost $19. 99 each and 4 more pairs of shorts that cost $14. 99 each. Which expression represents the total amount Marissa spent? StartFraction x 3 over 19. 99 EndFraction StartFraction y 4 over 14. 99 EndFraction StartFraction 3 x over 19. 99 EndFraction StartFraction 4 y over 14. 99 EndFraction 19. 99 (x 3) 14. 99 (y 4) (3 x) 19. 99 (4 y) 14. 99.