In 1975 the price of gasoline per gallon was 52.5 cents. with the 1975 price as the reference value, the gasoline price index for 1998 is 192.4. what was the cost of a gallon of gasoline in 1998?

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 : )