The Set A has 6 elements inside it. How many subset is possible?

Nnnnneeedd 1.find the residual if you know the actual number is 5.2 and the predicted value is 4.8

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

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 : )