This dart board is made up of three concentric circles. a dart will be randomly tossed at the board. what is the probability the dart will land in the section labeled with a x?

What is the quotient of -3/8and-1/3?

Aline passes through 3,7 and 6,9 what equation represents the line

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.