7+3x=2x+2 can u solve it and teach how to do it?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.

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.

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?