Round 39.186 to the nearest hundredth

What is the solution set of the quadratic inequality x^2-5< or equal to 0

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 : )

Benjamin is making bow ties. how many 1/2yards lomg bow ties can he make if he has 18 feet of fabric?