You agree to do so. They publish the booklet and send it to thousands of customers. It is an implied work for hire because you are on the payroll. You are teaching chemistry at Northern South Dakota in Hoopla. You copy ten papers from the chemical literature, write a brief preface and table of contents, and send the packet for copying to the college bookstore.
Students purchase the packet at essentially the cost of the copying.
Generally no, unless you get written permission from the copyright holders of the papers. On a one-time rush case, you may, in accordance with legislative guidelines, hand out individual copies of the papers, but you may not sell them through a bookstore or copy shop.