Find a video of wave happening in a stadium. Use some super sleuthing to determine the speed of the wave. Provide a link to the video as well as a thorough walkthrough of how you solved this problem.

What are the first 4 terms in the multiplication pattern given by the formula 2×4n

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

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.