Hey ppl!^-^ Can you help me with this stupid problem (◔_◔)

5^2 x 5^(-5)=

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3

How does reflecting or rotating a figure change the interior angles of the figure?

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.