Choose an equation for the relationship between the measurement of the segments, angles, and arcs? ?

The difference between tax advoidance and tax evasion

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

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 : )