What is one way you could compare decimal numbers of different lengths?

With math question will mark brainliest question in the pic.

Write the equation in logarithmic form m^x=n

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 : )