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