Aclass contributed $8.40 in dimes and quarters to the red cross. in all, there were 45 coins. how many coins of each kind were there?

10 points? me . its important ‼️‼️

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.

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.