In rectangle WXYZ , the diagonals intersect at point A, ZA = 2.5b , and WY = 36 What is the value of b?

What is the exact volume of the cylinder (radius 13 in., height 30 in.)

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

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.