This is 10th grade geometry! HELP

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

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?