Copyright © 2018
by
The Goodheart-Willcox Company, Inc.
Previous editions copyright 2014, 2010, 2004
All rights reserved. No part of this work may be reproduced, stored, or
transmitted in any form or by any electronic or mechanical means, including
information storage and retrieval systems, without the prior written permission of
The Goodheart-Willcox Company, Inc.
Manufactured in the United States of America.
ISBN 978-1-63126-549-5
2 3 4 5 6 7 8 9 10 — 18 — 20 19 18 17
The Goodheart-Willcox Company, Inc. Brand Disclaimer: Brand names, company names, and illustrations for products
and services included in this text are provided for educational purposes only and do not represent or imply endorsement or
recommendation by the author or the publisher.
The Goodheart-Willcox Company, Inc. Safety Notice: The reader is expressly advised to carefully read, understand, and ap-
ply all safety precautions and warnings described in this book or that might also be indicated in undertaking the activities and
exercises described herein to minimize risk of personal injury or injury to others. Common sense and good judgment should
also be exercised and applied to help avoid all potential hazards. The reader should always refer to the appropriate manufac-
turer’s technical information, directions, and recommendations; then proceed with care to follow specifi equipment operating fic
instructions. The reader should understand these notices and cautions are not exhaustive.
The publisher makes no warranty or representation whatsoever, either expressed or implied, including but not limited to
equipment, procedures, and applications described or referred to herein, their quality, performance, merchantability, or fit- fi
ness for a particular purpose. The publisher assumes no responsibility for any changes, errors, or omissions in this book. The
publisher specifi disclaims any liability whatsoever, including any direct, indirect, incidental, consequential, special, or fically
exemplary damages resulting, in whole or in part, from the reader’s use or reliance upon the information, instructions, proce-
dures, warnings, cautions, applications, or other matter contained in this book. The publisher assumes no responsibility for the
activities of the reader.
The Goodheart-Willcox Company, Inc. Internet Disclaimer: The Internet listings provided in this text link to additional
resource information. Every attempt has been made to ensure these sites offer accurate, informative, safe, and appropriate in-
formation. However, Goodheart-Willcox Publisher has no control over these websites. The publisher makes no representation
whatsoever, either expressed or implied, regarding the content of these websites. Because many websites contain links to other
sites (some of which may be inappropriate), the publisher urges teachers to review all websites before students use them. Note
that Internet sites may be temporarily or permanently inaccessible by the time readers attempt to use them.
Front cover image: © iStock.com/Natalia Bratslavsky
Back cover image: fg76/Shutterstock.com