Solve on the Interval

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

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 : )

How is this equation completed? i cannot find any examples in the book.