Which expression is eqivalent to square root of 80

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

Answer pls man im trying to get out of summer school

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 : )