Rayne has 2 2/7 cups of popcorn. she wants to split into 2/3 cup portions. how many portions will she have?

For what values of x is x2 + 2x = 24 true?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

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.