Hi i have two questions:

what is the probability of red marbles? 6 red marbles, 5 yellow, 3 green marbles.

what is the mean, median, mode, and range for this list: 70,70,71,72,76 and 70,70,72,76

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

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.