Que se debe acer cuando ahí dos : puntos en una operación matemática

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.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0

Laura read 1/8 of a comic book in 2 days. she reads the same number of pages every day. what part of the book does she read in a week