which is an example of the opposite of a sum property?

16 + (–16) = 0

–8 + (–13) = –13 + (–8)

11 + (–14 + 5) = (11 + (–14)) + 5

–(22 + 1) = –22 + (–1)

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.