Algebra 1 - Volume 1_2015_ Student_Edition

700 Pages·2014·41.87 MB·English

Algebra 1
Algebra 1

Volume 1

TIMOTHY D. KANOLD

EDWARD B. BURGER

JULI K. DIXON

MATTHEW R. LARSON

STEVEN J. LEINWAND

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Authors

Timothy D. Kanold, Ph.D., is an
award-winning international educator,
author, and consultant. He is a former
superintendent and director of
mathematics and science at Adlai E.
Stevenson High School District 125
in Lincolnshire, Illinois. He is a past
president of the National Council of
Supervisors of Mathematics (NCSM)
and the Council for the Presidential
Awardees of Mathematics (CPAM). He
has served on several writing and leadership commissions
for NCTM during the past decade. He presents motivational
professional development seminars with a focus on developing
professional learning communities (PLC’s) to improve the
teaching, assessing, and learning of students. He has recently
authored nationally recognized articles, books, and textbooks
for mathematics education and school leadership, including
What Every Principal Needs to Know about the Teaching and
Learning of Mathematics.

Edward B. Burger, Ph.D., is the
President of Southwestern University,
a former Francis Christopher Oakley
Third Century Professor of Mathematics
at Williams College, and a former vice
provost at Baylor University. He has
authored or coauthored more than sixty-
five articles, books, and video series;
delivered over five hundred addresses
and workshops throughout the world;
and made more than fifty radio and
television appearances. He is a Fellow of the American
Mathematical Society as well as having earned many national
honors, including the Robert Foster Cherry Award for Great
Teaching in 2010. In 2012, Microsoft Education named him a
“Global Hero in Education.”

Juli K. Dixon, Ph.D., is a Professor
of Mathematics Education at the
University of Central Florida. She has
taught mathematics in urban schools
at the elementary, middle, secondary,
and post-secondary levels. She is an
active researcher and speaker with
numerous publications and conference
presentations. Key areas of focus are
deepening teachers’ content knowledge
and communicating and justifying
mathematical ideas. She is a past chair of the NCTM Student
Explorations in Mathematics Editorial Panel and member of the
Board of Directors for the Association of Mathematics Teacher
Educators.

Matthew R. Larson, Ph.D., is the K-12
mathematics curriculum specialist for
the Lincoln Public Schools and served on
the Board of Directors for the National
Council of Teachers of Mathematics from
2010 to 2013. He is a past chair of
NCTM’s Research Committee and
was a member of NCTM’s Task Force
on Linking Research and Practice.
He is the author of several books on
implementing the Common Core
Standards for Mathematics. He has taught mathematics at
the secondary and college levels and held an appointment as
an honorary visiting associate professor at Teachers College,
Columbia University.

Steven J. Leinwand is a Principal
Research Analyst at the American
Institutes for Research (AIR) in
Washington, D.C., and has over 30 years
in leadership positions in mathematics
education. He is past president of the
National Council of Supervisors of
Mathematics and served on the NCTM
Board of Directors. He is the author of
numerous articles, books, and textbooks
and has made countless presentations
with topics including student achievement, reasoning,
effective assessment, and successful
implementation of standards.

Robert Kaplinsky
Teacher Specialist, Mathematics
Downey Unified School District
Downey, California

Mindy Eden
Richwoods High School
Peoria School District
Peoria, IL

Dustin Johnson
Badger High School Math Teacher
Department Chair
Lake Geneva-Genoa City Union
High School District
Lake Geneva, WI

Ashley D. McSwain
Murray High School
Murray City School District
Salt Lake City, UT

Rebecca Quinn
Doherty Memorial High School
Worcester Public Schools District
Worcester, MA

Ted Ryan
Madison LaFollette High School
Madison Metropolitan School District
Madison, WI

Tony Scoles
Fort Zumwalt School District
O’Fallon, MO

Cynthia L. Smith
Higley Unified School District
Gilbert, AZ

Phillip E. Spellane
Doherty Memorial High School
Worcester Public Schools District
Worcester, MA

Mona Toncheff
Math Content Specialist
Phoenix Union High School District
Phoenix, AZ

Performance Task Consultant

Reviewers

Michael A. DiSpezio
Global Educator
North Falmouth, Massachusetts

Michael R. Heithaus
Executive Director, School of Environment, Arts,
and Society
Professor, Department of Biological Sciences
Florida International University
North Miami, Florida

STEM Consultants
Science, Technology, Engineering, and Mathematics

UNIT

Volume 1

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1

Quantities and
Modeling

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Quantitative Reasoning

Real-World Video . . . . . . . . . . . . . .3
Are You Ready? . . . . . . . . . . . . . . . 4

1.1 Solving Equations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Modeling Quantities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3 Reporting with Precision and Accuracy . . . . . . . . . . . . . . . . . . . . . 27

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Algebraic Models

Real-World Video . . . . . . . . . . . . 43
Are You Ready? . . . . . . . . . . . . . . 44

2.1 Modeling with Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2.2 Creating and Solving Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2.3 Solving for a Variable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
2.4 Creating and Solving Inequalities. . . . . . . . . . . . . . . . . . . . . . . . . . . 73
2.5 Creating and Solving Compound Inequalities . . . . . . . . . . . . . . . 81

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Unit 1 Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

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Understanding
Functions

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
2

Functions and Models

Real-World Video . . . . . . . . . . . 103
Are You Ready? . . . . . . . . . . . . .104

3.1 Graphing Relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
3.2 Understanding Relations and Functions . . . . . . . . . . . . . . . . . . . 115
3.3 Modeling with Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
3.4 Graphing Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152

Patterns and Sequences

Real-World Video . . . . . . . . . . . 153
Are You Ready? . . . . . . . . . . . . .154

4.1 Identifying and Graphing Sequences . . . . . . . . . . . . . . . . . . . . . . 155
4.2 Constructing Arithmetic Sequences . . . . . . . . . . . . . . . . . . . . . . . 165
4.3 Modeling with Arithmetic Sequences. . . . . . . . . . . . . . . . . . . . . . 175

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .187
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .188
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190

Unit 2 Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

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Linear Functions, Equations,
and Inequalities

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
3

Linear Functions

Real-World Video . . . . . . . . . . . 197
Are You Ready? . . . . . . . . . . . . .198

5.1 Understanding Linear Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . 199
5.2 Using Intercepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
5.3 Interpreting Rate of Change and Slope . . . . . . . . . . . . . . . . . . . . 221

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .234
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .236

Forms of Linear Equations

Real-World Video . . . . . . . . . . . 237
Are You Ready? . . . . . . . . . . . . .238

6.1 Slope-Intercept Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
6.2 Point-Slope Form . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
6.3 Standard Form. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
6.4 Transforming Linear Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
6.5 Comparing Properties of Linear Functions . . . . . . . . . . . . . . . . . 281

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .295
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .296
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .297
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .298

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UNIT

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3

Linear Equations and Inequalities

Real-World Video . . . . . . . . . . . 299
Are You Ready? . . . . . . . . . . . . .300

7.1 Modeling Linear Relationships. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
7.2 Using Functions to Solve One-Variable Equations . . . . . . . . . . 309
7.3 Linear Inequalities in Two Variables . . . . . . . . . . . . . . . . . . . . . . . . 323

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .335
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .336
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .337
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .338

Unit 3 Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339

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4

Statistical
Models

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

Multi-Variable Categorical Data

Real-World Video . . . . . . . . . . . 345
Are You Ready? . . . . . . . . . . . . .346

8.1 Two-Way Frequency Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
8.2 Relative Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .371
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .372
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .373
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .374

One-Variable Data Distributions

Real-World Video . . . . . . . . . . . 375
Are You Ready? . . . . . . . . . . . . .376

9.1 Measures of Center and Spread. . . . . . . . . . . . . . . . . . . . . . . . . . . . 377
9.2 Data Distributions and Outliers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
9.3 Histograms and Box Plots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401
9.4 Normal Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .429
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .430
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .431
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .432

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Linear Modeling and Regression

Real-World Video . . . . . . . . . . . 433
Are You Ready? . . . . . . . . . . . . .434

10.1 Scatter Plots and Trend Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435
10.2 Fitting a Linear Model to Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .467
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .468
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .469
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .470

Unit 4 Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471

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Solving Systems of Linear
Equations

Real-World Video . . . . . . . . . . . 477
Are You Ready? . . . . . . . . . . . . .478

11.1 Solving Linear Systems by Graphing. . . . . . . . . . . . . . . . . . . . . . 479
11.2 Solving Linear Systems by Substitution . . . . . . . . . . . . . . . . . . . 491
11.3 Solving Linear Systems by Adding or Subtracting . . . . . . . . . 503
11.4 Solving Linear Systems by Multiplying First . . . . . . . . . . . . . . . 515

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .527
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .528
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .529
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .530

Modeling with Linear Systems

Real-World Video . . . . . . . . . . . 531
Are You Ready? . . . . . . . . . . . . .532

12.1 Creating Systems of Linear Equations . . . . . . . . . . . . . . . . . . . . 533
12.2 Graphing Systems of Linear Inequalities. . . . . . . . . . . . . . . . . . 547
12.3 Modeling with Linear Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . 557

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .571
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .572
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .573
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .574

UNIT5

Volume 1

Linear Systems and
Piecewise-Defined Functions

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 476

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Piecewise-Defined Functions

Real-World Video . . . . . . . . . . . 575
Are You Ready? . . . . . . . . . . . . .576

13.1 Understanding Piecewise-Defined Functions . . . . . . . . . . . . . 577
13.2 Absolute Value Functions and Transformations . . . . . . . . . . . 589
13.3 Solving Absolute Value Equations . . . . . . . . . . . . . . . . . . . . . . . . 601
13.4 Solving Absolute Value Inequalities . . . . . . . . . . . . . . . . . . . . . . 611

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .625
Module Performance Task . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .626
Ready to Go On?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .627
Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .628

Unit 5 Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629

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Rational Exponents and Radicals

Real-World Video . . . . . . . . . . . 635
Are You Ready? . . . . . . . . . . . . .636

14.1 Understanding Rational Exponents and Radicals. . . . . . . . . . 637
14.2 Simplifying Expressions with Rational Exponents

and Radicals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .661
Module Performance Task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .662
Ready to Go On? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .663
Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .664

Geometric Sequences and
Exponential Functions

Real-World Video . . . . . . . . . . . 665
Are You Ready? . . . . . . . . . . . . .666

15.1 Understanding Geometric Sequences . . . . . . . . . . . . . . . . . . . . 667
15.2 Constructing Geometric Sequences . . . . . . . . . . . . . . . . . . . . . . 679
15.3 Constructing Exponential Functions. . . . . . . . . . . . . . . . . . . . . . 693
15.4 Graphing Exponential Functions . . . . . . . . . . . . . . . . . . . . . . . . . 707
15.5 Transforming Exponential Functions. . . . . . . . . . . . . . . . . . . . . . 721

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .733
Module Performance Task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .734
Ready to Go On? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .735
Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .736

Exponential
Relationships

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 633
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 634

UNIT6

Volume 2

MODULE14

MODULE15

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Collection Inc/Alamy Images

Exponential Equations and Models

Real-World Video . . . . . . . . . . . 737
Are You Ready? . . . . . . . . . . . . .738

16.1 Using Graphs and Properties to Solve

Equations with Exponents . . . . . . . . . . . . . . . . . . . . . . . . . 739

16.2 Modeling Exponential Growth and Decay. . . . . . . . . . . . . . . . . 751
16.3 Using Exponential Regression Models . . . . . . . . . . . . . . . . . . . . 765
16.4 Comparing Linear and Exponential Models . . . . . . . . . . . . . . . 779

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .793
Module Performance Task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .794
Ready to Go On? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .795
Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .796

Unit 6 Assessment Readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .797

MODULE16

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McNally/Photonica World/Getty Images

Polynomial
Operations

Math in Careers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 801
Reading Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 802

Adding and Subtracting
Polynomials

Real-World Video . . . . . . . . . . . 803
Are You Ready? . . . . . . . . . . . . .804

17.1 Understanding Polynomial Expressions . . . . . . . . . . . . . . . . . . . . . . . 805
17.2 Adding Polynomial Expressions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 817
17.3 Subtracting Polynomial Expressions. . . . . . . . . . . . . . . . . . . . . . . . . . . 829

Study Guide Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .841
Module Performance Task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .842
Ready to Go On? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .843
Assessment Readiness. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .844

UNIT7

Volume 2

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