Rafeal counted a total of 40 white cars and yellow cars. there were 9 times as many white cars as yellow cars. how many white cars did rafael count?

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1

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.