I'm not sure how to do this. help?

2/3(-6y+9x) expand each expression using the distributive property

Aubrey read 29 books and eli read 52 books what number equals to the number of books aubrey read

Concerned about campus safety, college officials want to estimate the percentage of students who carry a gun, knife, or other such weapon. how many randomly selected students must be surveyed in order to be 95 % confident that the sample percentage has a margin of error of two percentage points?