-7=z/2+1 also I step by step plz help if u can't it's ok but plz try also have a god day and eat and drink water also stay safe PLZ HELP

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

When only separate discreet points are graphed it is called?

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.