There were c pieces of candy in a box of chocolates. Six pieces have been eaten. Justify which expression correctly models how many pieces of candy are left. Answer Choices 6−c , because this is a subtraction problem, and you want to know how many pieces of candy are left. c−6 , because c is the number of pieces in a box, and then you subtract the 6 that have been eaten . c+6 , because there were c pieces in the box, and then you add the 6 pieces that have been eaten. c÷6 , because there are c pieces in the box, and you divide up the pieces to find how many are left.