It is Erika's turn to spin in a game she is playing with her friends. What is the probability that Erika will get to move ahead on this spin ? A)5/8 B)1/3 C)3/8 D)1/2

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.

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Given abc find the values of x and y. in your final answer, include all of your calculations.