I think it’s either b or c. But I’m leaning more towards c
Explanation:
The formula isnt correctly written, it should state:

You have to start from
and end in a³+b³. On your first step, you need to use the distributive property.

This is equal to

Note that the second term, -a²b, is cancelled by the fourth term, ba², and the third term, ab², is cancelled by the fifht term, -b²a. Therefore, the final result is a³+b³, as we wanted to.
N-8 or 8-n I would assume
4.5 cups to ounces is 36 fluid ounces.