The coordinates of point a are (-6,4). the coordinates of point b are (3,4)which expression represent the distance in units between point a ans b

How do you use the elimination method for this question? explain, because i really want to understand!

Last week , donnell practiced the piano 3 hours longer than marcus . together, marcus and donnell practiced the piano 11 hours . for how many hours did each young man practiced the piano

Sawsan recorded the favorite sport of students at her school. she surveyed 200 students. how many students chose tennis?