In 2010, Washington Township created recreational soccer programs for the spring and fall seasons. The table shows the number of participants who registered for each season during the first four years. Participation in Town Soccer Programs
Year
Spring league
Fall league
2010
68
145
2011
79
148
2012
90
151
2013
101
154

Is the product of seventeen negative numbers, positive or negative ?

If the value of cos330°is√3/2 then find cos 165°.

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.