Express the distance between the given numbers using absolute value. Then find the distance by evaluating the absolute value expression.
- 3.2 and -1.4

The expression for the distance between -3.2 and - 1.4 is?

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.