The cost to rent a video game for 3 days was $10. it costs the same amount each day.

Can someone me and do the problem plz so i can understand it more better

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.