Uh, I assume you're talking about Percy Jackson. The answer would be the flying shoes, which Percy cannot use because flying would mean entering Zeus's territory, and Percy and Zeus are not getting along. I hope this helps!
The answer is 24, 26, and 28
Your answer is 18 because your dividing
The rules for multiplying powers with the same base is you are basically doing the pemdas method Please Excuse My Dear Aunt Sally pemdas