What is one point that lies in the solution set of the system of inequalities graphed?

Find the interior angle of a regular polygon which has 6 sides

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

Find the solution on the interval [0, 2pi)