A full bag of dog food weighs 55 pounds. Each scoop removes 0.5 pounds of dog food from the bag. What does the expression 55 - 0.5x represent? the number of scoops of dog food that have been removed from the bag the amount of dog food remaining in the bag after x scoops the number of scoops it will take to empty the bag the amount of dog food removed from the bag by x scoops