Together Mike and Sara ran 42 laps on the track. Sara ran twice as many laps as
Mike did. Write a system of equations and
solve it to see how many laps they each ran.

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 : )