Does anyone understand this, please help

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

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 : )

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)