Rewrite the following polynomial in standard form.
-6x^2+1+7x

Give me the equations of two lines that have the same slope but are not parallel.

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.

Is a triangle with sides of length 6ft, 21 ft, 23 ft. a right triangle?