What is the product? (−4)⋅(−6)⋅(−3)⋅(−5) −360 −240 240 360

How do you write something in scientific notation?

Construct the graph that models the given situation

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.