Write a second equation for the third biker, Lauren, who rides twice as fast as Kevin. Use Y to represent the numbers of miles Lauren travels in x hours

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

Could somebody me with this radical simplification?

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.