Colin was using the back of his book to check his homework answers. The answer that he had on his paper was −13 − (15 + 58) − 1 3 − ( 1 5 + 5 8 ) . The correct answer, located in the back of the book, was −13 −15 + 58 − 1 3 − 1 5 + 5 8 . Was Colin correct?