Evan went to the park and saw for animals animals either duck her dog if you saw total 14 legs how many of each animal did he see

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Solve the equation - 2(m -30) = -6m a-15 b-13 c-8 d8

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.