Carmen is designing an intersection of the rail line and four streets. she wants to know which streets are parallel. which streets are parallel? check all that apply. a. c || d b. c || e c. c || f d. d || e e. d || f f. e || f

What statement is true? 2x^2-9x+2=-1

We just started the introduction into circles and i have no idea how to do this.

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.