The distance between -8 and 6

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.

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle