What is 6a^2b^2/2ab^2 in lowest terms

Which term best describes the association between variables a and b

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.

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?