Edwin is taking his pitbull to the dog boarder while he and his family go on vacation to Ireland. He needs to know how many cups of dog food he should pack. His pitbull will be boarded for a total of 9 days, and she gets x cups of food each morning and y cups of food each evening.
Pick all the expressions that represent how many cups of food Edwin should pack.
Answer choices:
18(x+y)
9+x+y
9x+9y
9(x+y)