A librarian was packing some books. She discarded 22 books with torn pages.

She then packed the rest equally into 9 shelves.

There were 11 books on each shelf.

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.

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?