Karla is ordering a pizza. The cost of the pizza is $8.99, plus she must pay $1.50 for each additional topping. Write an equation that represents the total cost of the pizza, P, if she orders t toppings. NEED HELP ASAP PLS

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.