Aschool is planning a field trip to a theme park. a ticket to the park costs $21. for a group of 50 or more, there is a 16% discount. the school saved $756 with the discount. how many tickets did the school buy?

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 : )