20 points! answer the questions on the picture!

In the 30-60-90 triangle below side s has a length of and side r has a length

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

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.