\frac{x^2+5x+4}{3x+15}\cdot \frac{x^2+12x+35}{x^2+8x+7}\div \frac{x+4}{-2x} 3x+15 x 2 +5x+4 ​ ⋅ x 2 +8x+7 x 2 +12x+35 ​ ÷ −2x x+4 ​

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

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.

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?