Identify two segments that are marked parallel to each other on the diagram below.(diagram is not to scale)

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(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.

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?