Train A is 15 miles per hour faster than Train B whose speed is x. Train A travels 430 miles in the same time that Train B travels 355 miles

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.

Look at the chart showing the results of a baseball player at bat. which is the probability of getting a hit?

Which represents the number of times all outcomes less than a given outcome occur? cumulative frequency relative frequency frequency cumulative relative frequency