21. Negative: Negative
22. Example: A relay race covers 1 1/2 miles, and each runner on the team will run 1/4 of a mile. How many runners are needed for the team?
25. Idk
26. No
27. No, Division by zero is an operation for which you cannot find an answer, so it is disallowed. You can understand why if you think about how division and multiplication are related. But no value would work for x because 0 times any number is 0
28. In the left, in order, or cant divide it at all