The range and the standard deviations of the data set 40,35,45,55,60

What is the range of the relation in the table below? x y –2 0 –1 2 0 4 1 2 2 0

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?