Mai had $14.50. She spent $4.35 at the snack bar and $5.25 at the arcade. What is the exact amount Mai has left?

Its worth 10000000 points need asap if you answer correctly ill mark brainliest

Can you me find the slope! (30 points)

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.