If x = 3 calculate the value of x2+x

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

Given right triangle xyz, which correctly describes the locations of the sides in relation to

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.