What is 85.89% as a decimal?

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.

Could somebody me with this radical simplification?

If the discriminant if a quadratic equation is 4 which statement describes the roots?