Thia question id hard can anyone factor this

Factor 3h^2+3h-18

What are “like terms”? why can we only add like terms?

What numbers are included in the set of integers? what numbers are not included?

Sue's average score for three bowling games was 162. in the second game, sue scored 10 less than in the first game. in the third game, she scored 13 less than in the second game. what was her score in the first game?