Square root of 50 is rational true or false

How many solutions does the nonlinear system of equations graphed below have?

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.

Afamily went out to dinner and their bill was $113.if they want to leave a 19% tip, how much should they leave.