Can anyone help me in dis rq!

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.

Graph the line with the given slope m and y-intercept b. m=-3,b=1

If each bricks costs and he can only buy one brick how much will it cost him to get the material to put around the outside of his garden?