The volume of a sphere whose diameter is 18 centimeters is π cubic centimeters. if its diameter were reduced by half, its volume would be of its original volume.

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

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.