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Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

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.