Given -2ab, under what conditions would the solution be positive? justify your answer by showing numerical examples.

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 approximate mark up percentage rate before m equals $1740 marked up from p equals $19,422

What is the inverse of the function fx = 2x-10