SOMEONE HELP WANTED I'M GIVING EXTRA POINTS!! (no guessing and no links or I will report you) (btw it says equation* at the end)

What is the ratio if counted 14 robins out of 150

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )