19. Make sense of problems. Mrs. Tandy paid a $50 registration fee to join Fitness Club. She pays a monthly rate of $25. Write an equation to represent the total Mrs. Tandy pays for Fitness Club for x months. Determine if the equation you wrote represents a proportional relationship or a nonproportional relationship. Explain your reasoning.

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.

Let event a = you roll an even number on the first cube.let event b = you roll a 6 on the second cube.are the events independent or dependent? why?

The area of each triangle is 7 square units. the surface area of the triangular prism is