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Entries (With Areas of Discussion)

Addition

Financial Addition ............ 4

Geometric Progression .......... 6

Poker, Probability, and Other Uses of Addition .. 5

Sports and Fitness Addition ......... 3

Using Addition to Predict and Entertain .... 6

Algebra

Art ................. 21

Building Skyscrapers ........... 19

Buying Light Bulbs ........... 20

College Football ............ 14

Crash Tests .............. 18

Fingerprint Scanners ........... 22

Flying an Airplane ............ 16

Fundraising .............. 19

Personal Finances ............ 13

Population Dynamics ........... 22

Private Space Travel ........... 24

Skydiving ............... 17

Teleportation .............. 23

UPC Barcodes ............. 15

Algorithms

Archeology .............. 27

Artificial Intelligence ........... 32

Computer Programming ......... 27

Credit Card Fraud Detection ........ 27

Cryptology .............. 28

Data Mining .............. 28

Digital Animation and Digital Model Creation .. 28

DNA or Genetic Analysis ......... 28

Encryption and Encryption Devices ...... 28

The Genetic Code ............ 30

Imaging ............... 29

Internet Data Transmission ......... 29

Linguistics, the Study of Language ...... 31

Mapping ............... 30

Market or Sales Analysis .......... 30

Operational Algorithms .......... 27

Security Devices ............ 31

Sports Standings and Seedings ........ 31

Tax Returns .............. 31

Architectural Math

Architectural Concepts in Wheels ....... 43

Architectural Symmetry in Buildings ..... 38

Architecture .............. 36

Astronomy .............. 43

Ergonomics .............. 41

Geometry, Basic Forms and Shapes of ..... 40

Golden Rectangle and Golden Ratio ...... 38

Grids, Use of ............. 37

Jewelry ............... 41

Measurement ............. 35

Proportion .............. 34

Ratio ................ 33

Ratio and Proportion, Use of ........ 38

Scale Drawing ............. 34

Space, Use Of ............. 37

Sports ................ 38

Symmetry .............. 34

Symmetry in City Planning ......... 41

Technology .............. 41

Textile and Fabrics ............ 43

Area

Area of a Rectangle ........... 45

Areas of Common Shapes ......... 46

Areas of Solid Objects .......... 46

Buying by Area ............. 47

Car Radiators ............. 48

Cloud and Ice Area and Global Warming .... 47

Drug Dosing ............. 46

Filtering ............... 47

Solar Panels .............. 49

Surveying .............. 48

Units of Area ............. 45

Average

Arithmetic Mean ............ 51

The "Average" Family ........... 55

Average Lifespan ............ 57

Averaging for Accuracy .......... 55

Batting Averages ............ 53

Evolution in Action ........... 57

Geometric Mean ............ 52

Grades ................ 54

How Many Galaxies? ........... 55

Insurance ............... 57

Mean ................ 52

Median ............... 52

Space Shuttle Safety ........... 56

Student Loan Consolidation ........ 56

Weighted Averages in Business ........ 54

Weighted Averages in Grading ........ 54

Base

Base 2 and Computers .......... 60

Business Math

Accounting .............. 63

Budgets ............... 63

Earnings ............... 66

Interest ............... 67

Payroll ................ 65

Profits ................ 66

Calculator Math

Bridge Construction ........... 76

Combinatorics ............. 77

Compound Interest ........... 74

Financial Transactions .......... 73

Measurement Calculations ......... 75

Nautical Navigation ........... 73

Random Number Generator ........ 75

Supercomputers ............ 78

Understanding Weather .......... 77

Calculus

Applications of Derivatives ......... 86

Derivative .............. 81

Functions .............. 81

Fundamental Theorem of Calculus ...... 85

Integral ............... 83

Integrals, Applications .......... 91

Maxima and Minima ........... 85

Calendars

Gregorian Calendar ........... 99

Islamic and Chinese Calendars ........ 99

Leap Year ............... 99

Cartography

Coordinate Systems ........... 103

GIS-Based Site Selection .......... 105

GPS Navigation ............. 105

Map Projection ............. 100

Natural Resources Evaluation and Protection ... 105

Scale ................ 100

Topographic Maps ............ 104

Charts

Bar Charts .............. 109

Basic Charts .............. 107

Choosing the Right Type of Chart For the Data .. 112

Clustered Column Charts ......... 110

Column and Bar Charts .......... 109

Line Charts .............. 107

Pie Charts .............. 110

Stacked Column Charts .......... 110

Using the Computer to Create Charts ..... 112

X-Y Scatter Graphs ........... 109

Computers and Mathematics

Algorithms .............. 115

Binary System ............. 114

Bits ................ 116

Bytes ................ 116

Compression .............. 118

Data Transmission ............ 119

Encryption .............. 120

IP Address .............. 117

Pixels, Screen Size, and Resolution ...... 117

Subnet Mask .............. 118

Text Code .............. 116

Conversions

Absolute Systems ............ 127

Arbitrary Systems ............ 128

Cooking or Baking Temperatures ....... 127

Derived Units ............. 124

English System ............. 123

International System of Units (SI) ...... 123

Metric Units .............. 123

Units Based On Physical or "Natural" Phenomena ............ 124

Weather Forecasting ........... 126

Coordinate Systems

3-D Systems On Ordinance Survey Maps .... 136

Cartesian Coordinate Plane ......... 132

Changing Between Coordinate Systems ..... 132

Choosing the Best Coordinate System ..... 132

Commercial Aviation ........... 135

Coordinate Systems Used in Board Games .... 134

Coordinate Systems Used for Computer Animation ............. 134

Dimensions of a Coordinate System ...... 131

Longitude and John Harrison ........ 135

Modern Navigation and GPS ........ 135

Paper Maps of the World ......... 134

Polar Coordinates ............ 133

Radar Systems and Polar Coordinates ..... 136

Vectors ............... 132

Decimals

Grade Point Average Calculations ....... 139

Measurement Systems .......... 139

Science ............... 139

Demographics

Census ............... 142

Election Analysis ............ 141

Geographic Information System Technology ... 143

Discrete Mathematics

Algorithms ............. 145

Boolean Algebra ............ 145

Combinatorial Chemistry ......... 147

Combinatorics ............. 145

Computer Design ............ 146

Counting Jaguars Using Probability Theory ... 147

Cryptography ............. 146

Finding New Drugs with Graph Theory .... 147

Graphs ............... 146

Logic, Sets, and Functions ......... 144

Looking Inside the Body With Matrices ..... 147

Matrix Algebra ............. 146

Number Theory ............ 145

Probability Theory ............ 145

Searching the Web ............ 146

Shopping Online and Prime Numbers ..... 147

Division

Averages ............... 152

Division and Comparison ......... 151

Division and Distribution ......... 150

Division, Other Uses ........... 153

Practical Uses of Division For Students ..... 153

Domain and Range

Astronomers ............. 157

Calculating Odds and Outcomes ....... 157

Computer Control and Coordination ..... 157

Computer Science ............ 158

Engineering .............. 157

Graphs, Charts, Maps ........... 158

Physics ............... 157

Elliptic Functions

The Age of the Universe .......... 160

Conformal Maps ............ 159

E-Money ............... 160

Estimation

Buying a Used Car ............ 162

Carbon Dating ............. 165

Digital Imaging ............. 164

Gumball Contest ............ 163

Hubble Space Telescope .......... 165

Population Sampling ........... 164

Software Development .......... 166

Exponents

Bases and Exponents ........... 167

Body Proportions and Growth (Why Elephants Don't Have Skinny Legs) ............ 179

Credit Card Meltdown .......... 178

Expanding Universe ........... 178

Exponential Functions .......... 168

Exponential Growth ........... 171

Exponents and Evolution ......... 174

Integer Exponents ............ 167

Interest and Inflation ........... 177

Non-Integer Exponents .......... 168

Radioactive Dating ........... 177

Radioactive Decay ............ 175

Rotting Leftovers ............ 173

Scientific Notation ............ 171

Factoring

Codes and Code Breaking ......... 182

Distribution .............. 182

Geometry and Approximation of Size ..... 182

Identification of Patterns and Behaviors ........... 181

Reducing Equations ........... 181

Skill Transfer ............. 182

Financial Calculations, Personal

Balancing a Checkbook .......... 189

Budgets ............... 188

Buying Music ............. 184

Calculating a Tip ............ 194

Car Purchasing and Payments ........ 187

Choosing a Wireless Plan ......... 187

Credit Cards .............. 185

Currency Exchange ........... 195

Investing ............... 190

Retirement Investing ........... 192

Social Security System .......... 190

Understanding Income Taxes ........ 189

Fractals

Astronomy .............. 202

Building Fractals ............ 199

Cell Phone and Radio Antenna ....... 202

Computer Science ............ 202

Fractals and Nature ........... 200

Modeling Hurricanes and Tornadoes ...... 201

Nonliving Systems ............ 201

Similarity ............... 199

Fractions

Algebra ............... 205

Cooking and Baking ........... 206

Fractions and Decimals .......... 204

Fractions and Percentages ......... 204

Fractions and Voting ........... 208

Music ................ 206

Overtime Pay ............. 208

Radioactive Waste ............ 206

Rules For Handling Fractions ........ 204

Simple Probabilities ........... 207

Tools and Construction .......... 208

Types of Fractions ............ 203

What Is a Fraction? ........... 203

Functions

Body Mass Index ............ 214

Finite-Element Models .......... 212

Functions, Described ........... 210

Functions and Relations .......... 210

Guilloché Patterns ........... 211

Making Airplanes Fly ........... 211

The Million-Dollar Hypothesis ....... 212

Nuclear Waste ............. 213

Synths and Drums ............ 213

Game Math

Basic Board Games ............ 220

Card Games .............. 218

Magic Squares ............. 221

Math Puzzles ............. 223

Other Casino Games ........... 219

Game Theory

Artificial Intelligence ........... 230

Decision Theory ............ 228

eBay and the Online Auction World ...... 230

Economics .............. 229

Economics and Game Theory ........ 228

Evolution and Animal Behavior ....... 229

General Equilibrium ........... 229

Infectious Disease Therapy ......... 230

Nash Equilibrium ............ 229

Geometry

Architecture .............. 237

Fireworks ............... 241

Fourth Dimension ............ 245

Global Positioning ............ 239

Honeycombs ............. 239

Manipulating Sound ........... 241

Pothole Covers ............. 236

Robotic Surgery ............. 245

Rubik's Cube ............. 243

Shooting an Arrow ........... 244

Solar Systems ............. 242

Stealth Technology ............ 244

Graphing

Aerodynamics and Hydrodynamics ...... 259

Area Graphs .............. 252

Bar Graphs .............. 249

Biomedical Research ........... 258

Bubble Graphs ............. 257

Computer Network Design ......... 259

Finding Oil .............. 258

Gantt Graphs ............. 254

Global Warming ............ 257

GPS Surveying ............. 258

Line Graphs .............. 251

Physical Fitness ............. 259

Picture Graphs ............. 254

Pie Graphs .............. 252

Radar Graphs ............. 253

X-Y Graphs .............. 254

Imaging

Altering Images ............. 263

Analyzing Images ............ 263

Art ................. 267

Compression ............. 264

Creating Images ............ 263

Dance ................ 266

Forensic Digital Imaging .......... 266

Meat and Potatoes ............ 266

Medical Imaging ............ 264

Optics ................ 264

Recognizing Faces: a Controversial Biometrics Application ......... 264

Steganography and Digital Watermarks ..... 266

Information Theory

Communications ............ 273

Error Correction ............ 275

Information and Meaning ......... 273

Information Theory in Biology and Genetics ... 274

Quantum Computing .......... 276

Unequally Likely Messages ......... 271

Inverse

Anti-Sound .............. 282

The Brain and the Inverted Image On the Eye ............. 281

Cryptography ............. 280

Definition of an Inverse .......... 278

Fluid Mechanics and Nonlinear Design ..... 281

Inverse Functions ............ 279

The Multiplicative Inverse ......... 278

Negatives Used in Photography ....... 281

Operations Where the Inverse Does Not Exist ............. 279

Operations With More Than One Inverse .............. 279

Stealth Submarine Communications ...... 282

Stereo ................ 282

Iteration

Iteration and Business .......... 285

Iteration and Computers ......... 286

Iteration and Creativity .......... 285

Iteration and Sports ........... 284

Linear Mathematics

Earthquake Prediction .......... 289

Linear Programming ........... 291

Linear Reproduction of Music ........ 292

Recovering Human Motion From Video .... 290

Virtual Tennis ............. 291

Logarithms

Algebra of Powers of Logarithms ....... 296

Computer Intensive Applications ....... 297

Cryptography and Group Theory ....... 299

Designing Radioactive Shielding for Equipment in Space ........ 299

Developing Optical Equipment ........ 298

Estimating the Age of Organic Matter Using Carbon Dating ......... 298

Log Tables .............. 296

Logarithms to Other Bases Than 10 ...... 296

The Power of Mathematical Notation ..... 295

Powers and Logs of Base 10 ......... 295

Powers and Their Relation to Logarithms ............ 296

Supersonic and Hypersonic Flight ...... 299

Use in Medical Equipment ......... 298

Using a Logarithmic Scale to Measure Sound Intensity ........... 297

Logic

Boolean Logic ............. 300

Fuzzy Logic .............. 300

Proposition and Conclusion ........ 300

Reasoning .............. 300

Matrices and Determinants

Designing Cars ............. 305

Digital Images ............. 304

Flying the Space Shuttle .......... 305

Population Biology ........... 305

Measurement

Accuracy in Measurement ......... 309

Archaeology .............. 310

Architecture .............. 310

Blood Pressure ............. 310

Chemistry .............. 310

Computers .............. 310

The Definition of a Second ......... 310

Dimensions .............. 308

Doctors and Medicine ........... 310

Engineering .............. 309

Evaluating Errors in Measurement and Quality Control ......... 309

Gravity ............... 313

How Astronomers and NASA Measure Distances in Space .......... 312

Measuring Distance ........... 308

Measuring Mass ............ 313

Measuring the Speed of Gravity ....... 313

Measuring Speed, Space Travel, and Racing ... 310

Measuring Time ............ 310

Navigation .............. 310

Nuclear Power Plants ........... 310

Space Travel and Timekeeping ........ 312

Speed of Light ............. 312

Medical Mathematics

Calculation of Body Mass Index (BMI) ..... 319

Clinical Trials ............. 323

Genetic Risk Factors: the Inheritance of Disease .. 321

Rate of Bacterial Growth ......... 326

Standard Deviation and Variance for Use in Height and Weight Charts ...... 319

Value of Diagnostic Tests ......... 318

Modeling

Ecological Modeling ........... 330

Military Modeling ............ 331

Multiplication

Sports Multiplication: Calculating a Baseball ERA ........... 338

Calculating Exponential Growth Rates ..... 338

Calculating Miles Per Gallon ........ 341

Electronic Timing ............ 339

Exponents and Growth Rates ........ 337

Investment Calculations .......... 337

Measurement Systems .......... 339

Multiplication in International Travel ..... 339

Other Uses of Multiplication ........ 340

Rate of Pay .............. 339

Savings ............... 341

SPAM and Email Communications ...... 341

Music and Mathematics

Acoustic Design ............ 348

Compressing Music ........... 349

Computer-Generated Music ........ 349

Digital Music .............. 348

Discordance of the Spheres ......... 346

Electronic Instruments .......... 347

Error Correction ............ 349

Frequency of Concert A .......... 351

Mathematical Analysis of Sound ....... 347

Math-Rock .............. 351

Medieval Monks ............ 345

Pythagoras and Strings .......... 343

Quantification of Music .......... 345

Using Randomness ........... 349

Well-Tempered Tones ........... 346

Nature and Numbers

Fibonacci Numbers and the Golden Ratio .... 353

Mathematical Modeling of Nature ...... 354

Specify Application Using Alphabetizable Title .. 355

Using Fractals to Represent Nature ...... 355

Negative Numbers

Accounting Practice ........... 357

Buildings ............... 359

Flood Control ............. 358

The Mathematics of Bookkeeping ...... 357

Sports ................ 358

Temperature Measurement ......... 357

Number Theory

Cryptography ............. 362

Error Correcting Codes .......... 363

Odds

Odds in Everyday Life .......... 367

Odds in State Lotteries .......... 368

Odds, Other Applications ......... 369

Sports and Entertainment Odds ....... 366

Percentages

Calculating a Tip ............ 375

Compound Interest ........... 376

Definitions and Basic Applications ...... 372

Examples of Common Percentage Applications ............ 374

Finding the Base Rate ........... 374

Finding the Original Amount ........ 375

Finding the Rate of Increase or Decrease .... 375

Finding the Rate Percent .......... 374

Important Percentage Applications ...... 374

Percentage Change: Increase or Decrease .... 375

Public Opinion Polls ........... 379

Ratios, Proportions, and Percentages ...... 373

Rebate Period and Cost .......... 378

Rebates ............... 377

Retail Sales: Price Discounts and Markups and Sales Tax ............ 376

Sales Tax Calculation: In-Store Discount Versus Mail-In Rebate ......... 377

Sales Tax Calculations .......... 377

SAT Scores or Other Academic Testing ..... 383

Sports Math .............. 379

Tournaments and Championships ...... 382

Understanding Percentages in the Media .... 378

Using Percentages to Make Comparisons .... 379

Perimeter

Bodies of Water ............. 386

Landscaping .............. 386

Military ............... 387

Planetary Exploration ........... 388

Robotic Perimeter Detection Systems ..... 388

Security Systems ............ 386

Sporting Events ............ 386

Perspective

Animation .............. 392

Art ................. 391

Computer Graphics ........... 395

Film ................ 393

Illustration .............. 392

Interior Design ............. 394

Landscaping .............. 395

Photography Math

The Camera .............. 398

Depth of Field ............. 400

Digital Image Processing .......... 403

Digital Photography ........... 401

Film Speed .............. 398

Lens Aperture ............. 400

Lens Focal Length ............ 399

Photomicrography ............ 403

Reciprocity .............. 401

Shutter Speed ............. 399

Sports and Wildlife Photography ....... 402

Plots and Diagrams

Area Chart .............. 406

Bar Graphs .............. 406

Body Diagram ............. 414

Box Plot ............... 405

Circuit Diagram ............. 414

Diagrams ............... 404

Fishbone Diagram ............ 406

Flow Chart .............. 411

Gantt Charts ............. 413

Line Graph .............. 408

Maps ................ 413

Organization Charts ........... 413

Other Diagrams ............ 414

Pie Graph ............... 406

Polar Chart .............. 406

Properties of Graphs ........... 404

Scatter Graph ............. 405

Stem and Leaf Plots ........... 405

Street Signs .............. 414

Three-Dimensional Graph ......... 407

Tree Diagram ............. 412

Triangular Graph ............ 407

Weather Maps ............. 414

Powers

Acids, Bases, and pH Level ......... 418

Areas of Polygons and Volumes of Solid Figures ........... 417

Astronomy and Brightness of Stars ...... 418

Computer Science and Binary Logic .............. 417

Earthquakes and the Richter Scale ...... 417

The Powers of Nanotechnology ....... 418

Prime Numbers

Biological Applications of Prime Numbers .... 421

Probability

Gambling and Probability Myths ....... 425

Probability in Business and Industry ...... 427

Probability, Other Uses .......... 428

Probability in Sports and Entertainment .... 426

Security ............... 424

Proportion

Architecture .............. 432

Art, Sculpture, and Design ......... 432

Chemistry .............. 435

Diets ................ 436

Direct Proportion ............ 431

Engineering Design ........... 435

Ergonomics .............. 434

Inverse Proportion ............ 431

Maps ................ 434

Medicine ............... 434

Musical Instruments ........... 435

Proportion in Nature ........... 436

Solving Ratios With Cross Products ...... 430

Stock Market ............. 436

Quadratic, Cubic, and Quartic Equations

Acceleration .............. 439

Area and Volume ............ 439

Car Tires ............... 439

Guiding Weapons ............ 440

Hospital Size ............. 440

Just in Time Manufacturing ........ 440

Ratio

Age of Earth .............. 446

Automobile Performance ......... 445

Cleaning Water ............. 446

Cooking ............... 446

Cost of Gas .............. 443

Determination of the Origination of the Moon .. 447

Genetic Traits ............. 443

Healthy Living ............. 446

Length of a Trip ............ 443

Music ................ 445

Optimizing Livestock Production ....... 447

Sports ................ 445

Stem Cell Research ............ 446

Student-Teacher Ratio .......... 445

Rounding

Accounting .............. 451

Bulk Purchases ............. 450

Decimals ............... 450

Energy Consumption ........... 451

Length and Weight ........... 450

Lunar Cycles ............. 451

Mileage ............... 452

Pi ................. 450

Population .............. 451

Precision ............... 452

Time ................ 452

Weight Determination .......... 451

Whole Numbers ............. 449

Rubric

Analytic Rubrics and Holistic Rubrics ..... 455

General Rubrics and Task-Specific Rubrics .............. 455

Scoring Rubrics ............ 453

Sampling

Agriculture .............. 459

Archeology .............. 463

Astronomy .............. 462

Demographic Surveys .......... 462

Drug Manufacturing ........... 460

Environmental Studies .......... 462

Market Assessment ........... 463

Marketing .............. 463

Non-Probability Sampling ......... 458

Plant Analysis ............. 460

Probability Sampling ........... 457

Scientific Research ............ 460

Soil Sampling ............. 460

Weather Forecasts ............ 461

Scale

Architecture .............. 468

Atmospheric Pressure Using Barometer ..... 469

The Calendar ............. 469

Expanse of Scale From the Sub-Atomic to the Universe ........... 471

Interval Scale ............. 466

Linear Scale .............. 465

Logarithmic Scale ............ 465

Map Scale .............. 467

Measuring Wind Strength ......... 469

The Metric System of Measurement ...... 472

Music ................ 471

Nominal Scale ............. 467

Ordinal Scale ............. 467

Ratio Scale .............. 466

The Richter Scale ............ 470

Sampling ............... 472

Technology and Imaging ......... 469

Toys ................ 471

Weighing Scale ............. 468

Scientific Math

Aviation and Flights ........... 478

Bridging Chasms ............ 478

Discrete Math ............. 474

Earthquakes and Logarithms ........ 482

Equations and Graphs .......... 476

Estimating Data Used for Assessing Weather ... 477

Functions and Measurements ........ 473

Genetics ............... 483

Logarithms .............. 475

Matrices and Arrays ........... 475

Medical Imaging ............ 480

Rocket Launch ............. 480

Ships ................ 482

Simple Carpentry ............ 479

Trigonometry and the Pythagorean Theorem ... 474

Weather Prediction ........... 476

Wind Chill in Cold Weather ........ 476

Scientific Notation

Absolute Dating ............ 489

Chemistry .............. 486

Computer Science ............ 487

Cosmology .............. 487

Earth Science ............. 489

Electrical Circuits ............ 486

Electronics .............. 489

Engineering .............. 487

Environmental Science .......... 488

Forensic Science ............ 488

Geologic Time Scale and Geology ....... 488

Light Years, the Speed of Light, and Astronomy ........... 486

Medicine ............... 488

Nanotechnology ............ 490

Proteins and Biology ........... 490

Sequences, Sets, and Series

Genetics ............... 493

Operating On Sets ............ 492

Ordering Things ............ 493

Sequences .............. 491

Series ................ 492

Sets ................. 491

Using Sequences ............ 493

Sports Math

Baseball ............... 498

Basketball .............. 499

Cycling—Gear Ratios and How They Work .............. 505

Football—How Far was the Pass Thrown? .... 507

Football Tactics—Math as a Decision-Making Tool ......... 501

Golf Technology ............ 506

Math and the Science of Sport ........ 504

Math and Sports Wagering ......... 508

Math to Understand Sports Performance .... 497

Mathematics and the Judging of Sports ..... 504

Money in Sport—Capology 101....... 507

North American Football ......... 499

Pascal's Triangle and Predicting a Coin Toss ... 500

Predicting the Future: Calling the Coin Toss ... 500

Ratings Percentage Index (RPI) ....... 503

Rules Math .............. 496

Soccer—Free Kicks and the Trajectory of the Ball ............. 506

Understanding the Sports Media Expert .... 502

Square and Cube Roots

Architecture .............. 513

Global Economics ............ 515

Hiopasus's Fatal Discovery ......... 513

Names and Conventions .......... 512

Navigation .............. 514

Pythagorean Theorem .......... 513

Sports ................ 514

Stock Markets ............. 515

Statistics

Analysis of Variance ........... 522

Average Values ............. 519

Confidence Intervals ........... 522

Correlation and Curve Fitting ........ 521

Cumulative Frequencies and Quantiles ..... 521

Geostatistics .............. 525

Measures of Dispersion .......... 520

Minimum, Maximum, and Range ....... 518

Populations and Samples ......... 516

Probability .............. 517

Public Opinion Polls ........... 527

Quality Assurance ............ 526

Statistical Hypothesis Testing ........ 522

Using Statistics to Deceive ......... 523

Subtraction

Subtraction in Entertainment and Recreation ........... 533

Subtraction in Financial Calculations ..... 531

Subtraction in Politics and Industry ...... 535

Tax Deductions ............. 532

Symmetry

Architecture .............. 541

Exploring Symmetries .......... 539

Fractal Symmetries ........... 541

Imperfect Symmetries .......... 542

Symmetries in Nature .......... 542

Tables

Converting Measurements ......... 545

Daily Use ............... 549

Educational Tables ............ 545

Finance ............... 546

Health ................ 548

Math Skills .............. 544

Travel ................ 549

Topology

Computer Networking .......... 555

I.Q. Tests ............... 555

Möbius Strip ............. 555

Visual Analysis ............. 554

Visual Representation ........... 555

Trigonometry

Chemical Analysis ............ 566

Computer Graphics ........... 566

Law of Sines .............. 561

Measuring Angles ............ 557

Navigation .............. 562

Pythagorean Theorem ........... 559

Surveying, Geodesy, and Mapping ...... 564

Trigonometric Functions ......... 560

Types of Triangles ............ 558

Vectors, Forces, and Velocities ........ 563

Vectors

3-D Computer Graphics .......... 572

Drag Racing .............. 572

Land Mine Detection ........... 572

The Magnitude of a Vector ......... 569

Sports Injuries ............. 573

Three-Dimensional Vectors ......... 569

Two-Dimensional Vectors ......... 568

Vector Algebra ............. 570

Vectors in Linear Algebra ......... 571

Volume

Biometric Measurements .......... 581

Building and Architecture ......... 579

Compression Ratios in Engines ....... 579

Glowing Bubbles: Sonoluminescence ..... 579

Medical Applications ........... 578

Misleading Graphics ........... 581

Pricing ............... 577

Runoff ............... 582

Sea Level Changes ............ 580

Swimming Pool Maintenance ........ 581

Units of Volume ............ 575

Volume of a Box ............ 575

Volumes of Common Solids ........ 575

Why Thermometers Work ......... 580

Word Problems

Accounts and VAT ............ 592

Archaeology .............. 585

Architecture .............. 590

Average Height? ............ 593

Banks, Interest Rates, and Introductory Rates ... 591

Bearings and Directions of Travel ....... 592

Comparisons ............. 586

Computer Programming ......... 584

Cooking Instructions ........... 591

Creative Design ............. 584

Cryptography ............. 585

Decorating .............. 594

Disease Control ............. 591

Ecology ............... 587

Efficient Packing and Organization ...... 590

Engineering .............. 585

Exchange Rates ............. 586

Finance ............... 591

Geology ............... 591

Global Warming ............ 594

Graph Theory ............. 588

Hypothesis Testing ........... 585

Insurance .............. 584

Linear Programming ........... 588

Lotteries and Gambling .......... 591

Measuring Height of a Well ......... 594

Medicine and Cures ........... 585

MMR Immunization and Autism ....... 594

Navigation .............. 587

Opinion Polls ............. 593

Percentages .............. 586

Phone Companies ............ 586

Postman ............... 589

Proportion and Inverse Proportion ...... 586

Quality Control ............ 592

Ranking Test Scores ........... 589

Recipes ............... 591

ROTA and Timetables .......... 589

Searching in an Index .......... 590

Seeding in Tournaments .......... 590

Shortest Links to Establish Electricity to a Whole Town .......... 589

Software Design ............ 584

Stock Keeping ............. 592

Store Assistants ............. 592

Surveying .............. 592

Teachers ............... 584

Throwing a Ball ............ 593

Translation .............. 587

Travel and Racing ............ 586

Traveling Salesperson ........... 589

Weather ............... 593

Zero-Sum Games

Currency, Futures, and Stock Markets ..... 597

Experimental Gaming .......... 597

Gambling .............. 596

War ................. 597

Entries (With Areas of Discussion)

© 2006 Thomson Gale, a part of the Thomson Corporation.


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