The Library of Congress system for the following book is that every book receives a classification number that starts with 1-3 letters. Those letters give a general idea of the topic. The "Teaching New Math" book It's in the Q's for sciences, and more specifically QA's under math. So the answer will be looking for is QA.
A library is a room or building or place where many books are kept. Generally, libraries are public and allow people to take the books to read in their homes. Most libraries admit people to borrow books, and they can keep them for some weeks.
The primary purpose of the public library is to provide resources and services in a variety of media to meet the needs of individuals and groups for education, information, and personal development, including recreation and leisure.
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The sentences that contain an example of ethos are number 1, 3 and 5.
As a rhetorical device, ethos is grounded in the speaker's credibility, honesty or authority to involve the audience.
In sentence number 1, the fact that Gizmotry and Gadgetry has been active for 140 years implies that it has a good service and has been able to adapt and evolve with the market, so it can offer a better service.
In sentence number 3, all customer orders are right, or they're free the example of ethos is present in the display of confidence and authority and work ethic to the point that assure the customer that in the rare case that the order is not right, he or she will not have to pay for it.
In sentence number 5, the fact that the person prescribing the medication is wearing a stethoscope implies that he or she is a doctor with the knowledge and authority to prescribe Barco's medication.
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