Please help with this problem

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.