Question

9+(-7)
What is sebastian's error?

Answer 1

He took 9 instead of -9 and -7 instead of only 7

Explanation:

This will represent by -9 not only 9 in integers. Then, the movement of Sebastian is given by +7+(-9) Therefore, Sebastian's error is: He took 9 instead of -9 and -7 instead of only 7