#2 Segment AB has endpoints with coordinates A(3,6) and B(-2,-4).
In simplest radical form, the length of AB is?

Ineed to know the answer to this algebra question.

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.

How can you find the mean absolute deviation (mad) for this set of data?