What is bigger 16 inches or 1 1/2 feet?

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.

Collin did the work to see if 10 is a solution to the equation r/4=2.4

What is the slope of the line that passes through the points (–9, 2) and (0, 4)? the slope of the line is