The values _ are the roots of the quadratic equation_

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.

An elevator travels 310 feet in 10 seconds. at that speed, how far can't his elevator travel in 12 seconds?