Explain why an annuity is an example of a geometric series.

Can someone me and plz do the problem

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

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 : )