How do u add a fraction

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.

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers?