HELP PLZ

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

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 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83