How many more student have cats than dogs and birds combined

Name the quadrilaterals that have four equal sides.

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

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.