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The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

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.