All square roots are irrational except A. Neat squares B. Perfect squares C. lovely squares D. natural squares

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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?