Find the next two terms of the following arithmetic sequence:
5/6, 2/3, 1/2, 1/3,

a. 1/4, 1/5, 1/6
b. 0, (-1/3), (-2/3)
c. 1/6, 0, (-1/6)
d. 0, (-1/3), (-1/2)

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 : )