If x > 0, prove that x³+7x+1 > 3x² Restricted solving by
1. Graph
2. Substituting x-values.

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.

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

Aof 12 , we to a of 4 to on a .of 4 be ?