A number is less than twelve

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

Which statements are true? see picture

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.