5. let a be an m x n matrix. recall that the null space of a matrix a, written null(a), is the set of all r" such that ax 0. show that null(a) is a subspace of rn.

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 : )