What would the answer be because i already tried everything and i just can’t get it

In a graph with several intervals o data how does a constant interval appear? what type of scenario produces a constant interval?

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?

Dawn is selling her mp3 player for 3 4 of the original price. the original price for the mp3 player was $40. how much is she selling her mp3 player for?