1. You make a compound word, such as houseboat, by joining two words together. Why do you think -4 < x < 7 is called a compound inequality? 2. The intersection of two roads is the place where the roads cross. How would you define the intersection of two groups of objects?

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.