You have 187 yards of ribbon each ribbon will be the same length you want to use all of the ribbon should each ribbon be 7 1/2 8 1/2 or 9 1/2

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.