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v Contents Introduction .............................................................................................. xiii 1: Algebra ................................................................................................... 1 1.1: Variables and Equations................................................................... 2 Variables, Consecutive Integers, d=rt, Harmonic Mean, Moles Digging Holes. 1.2: Linear Equations ............................................................................. 10 Slope, Intercepts, Slope-Intercept Form, Point- Slope Form, Standard Form, Parallel/Perpendicu- lar Lines, Horizontal and Vertical Lines. 1.3: Systems of Equations..................................................................... 16 Substitution, Elimination, Common Word Problems, Cheating the System. 1.4: Ratios, Proportions, and Percents.................................................. 23 Ratios, Proportions, Percents, and Percent of Change. Review 1.1 to 1.4...................................................................................... 30 1.5: Distribution....................................................................................... 31 The Distributive Property, Difference of Squares and Perfect Squares, Sum of the Reciprocals. 1.6: Quadratics....................................................................................... 35 Perfect Squares, Difference of Squares, Factoring By Grouping, Solving Quadratics by Factoring, The Quadratic Formula, Word Problems, Sum and Product of the Roots. 1.7: Exponents and Radicals ................................................................. 44 Multiplying, Dividing, Raising a Power to a Power, Fractional Exponents, Square Roots. 1.8: Statistics..........................................................................................49 Mean, Median, Mode and Range. 1.9: Sequences and Series..................................................................... 52 Arithmetic Sequences and Series, Geometric Sequences and Series. 1.10: More Substitution......................................................................... 58 Nested Square Roots, Continued Fractions. Chapter Review ........................................................................................ 60

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  • v

    Contents

    Introduction..............................................................................................xiii

    1: Algebra...................................................................................................1

    1.1: Variables and Equations...................................................................2Variables, Consecutive Integers, d=rt, HarmonicMean, Moles Digging Holes.

    1.2: Linear Equations.............................................................................10Slope, Intercepts, Slope-Intercept Form, Point-Slope Form, Standard Form, Parallel/Perpendicu-lar Lines, Horizontal and Vertical Lines.

    1.3: Systems of Equations.....................................................................16Substitution, Elimination, Common WordProblems, Cheating the System.

    1.4: Ratios, Proportions, and Percents..................................................23Ratios, Proportions, Percents, and Percent ofChange.

    Review 1.1 to 1.4......................................................................................301.5: Distribution.......................................................................................31

    The Distributive Property, Difference of Squaresand Perfect Squares, Sum of the Reciprocals.

    1.6: Quadratics.......................................................................................35Perfect Squares, Difference of Squares, FactoringBy Grouping, Solving Quadratics by Factoring,The Quadratic Formula, Word Problems, Sum andProduct of the Roots.

    1.7: Exponents and Radicals.................................................................44Multiplying, Dividing, Raising a Power to aPower, Fractional Exponents, Square Roots.

    1.8: Statistics..........................................................................................49Mean, Median, Mode and Range.

    1.9: Sequences and Series.....................................................................52Arithmetic Sequences and Series,Geometric Sequences and Series.

    1.10: More Substitution.........................................................................58Nested Square Roots, Continued Fractions.

    Chapter Review........................................................................................60

  • 2: Counting..............................................................................................63

    2.1: Basics................................................................................................64Simple Counting Techniques.

    2.2: Venn Diagrams.................................................................................67Two and Three-Set Venn Diagrams.

    2.3: Bowling Pins and Handshakes......................................................70Triangular Number Patterns.

    2.4: Counting Outcomes.........................................................................73The Fundamental Counting Principle.

    2.5: Casework..........................................................................................75Keeping Organized.

    Review 2.1 to 2.5......................................................................................772.6: Factorials and Permutations...........................................................78

    Factorials, Permutations, Permutations withRestrictions.

    2.7: Combinations...................................................................................84Combinations, Paths on a Grid, Beyond Case-work, Complementary Counting.

    Review 2.1 to 2.7......................................................................................912.8: Sticks and Stones...........................................................................93

    With and Without Restrictions.2.9: Pascals Triangle...............................................................................97

    Combinations and Pascals Triangle.Chapter Review........................................................................................100

    3: Probability........................................................................................103

    3.1: Probability Basics..........................................................................104Compound Events, Dependent and Independent,Replacement, Cards.

    3.2: Compound Events and Counting...............................................111Combining Counting Techniques and CompoundProbability.

    3.3: Casework and Probability.............................................................1143.4: Probability and Combinations....................................................1163.5: Complementary Counting and Probability................................118Review 3.1 to 3.5......................................................................................1203.6: Geometric Probability....................................................................1213.7: Expected Value..............................................................................124

    Finding the average outcome.Chapter Review........................................................................................126

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    Table of Contents

  • vii

    Table of Contents

    4: Number Theory.........................................................................129

    4.1: Primes and Divisibility..................................................................130Sieve of Eratosthenes, Primes, Divisibility Rules.

    4.2: Factors............................................................................................137The Fundamental Theorem of Arithmetic, FactorCounting.

    4.3: Factor Tricks..................................................................................143Product of the Factors, Sum of the Factors, GCFand LCM, Factorials.

    Review 2.1 to 2.5......................................................................................1544.4: Different Bases.............................................................................155

    Notation, Basic Arithmetic.4.5: The Units Digit.............................................................................159

    Addition, Multiplication, Perfect Squares,Exponents.

    4.6: Fractions and Decimals................................................................163Repeating/Terminating, Conversions.

    4.7: Modular Arithmetic......................................................................167Chapter Review........................................................................................172

    5: Geometry......................................................................................175

    5.1: Geometry Basics...........................................................................176Lines, Angles, Triangles, Polygons, Trapezoids,Parallelograms, Kites.

    5.2: Circles.............................................................................................185Chords, Secants, Tangents, Arcs, InscribedAngles, Properties, Circumference and ArcLength.

    5.3: Pythagorean Theorem..................................................................193Triples, Special Right Triangles, DistanceFormula, Algebra and the Pythagorean Theorem.

    5.4: Area.................................................................................................204Formulas, Herons Formula, Altitudes, WorkingBackwards.

    5.5: Three-Dimensional Geometry......................................................208Polyhedra, Faces, Vertices, and Edges, Volume.

    5.6: Similarity.........................................................................................215Right Triangles, Circles, Parallel Lines, Area andVolume Relationships.

    Chapter Review........................................................................................226

  • 6: Solutions...........................................................................................229

    AlgebraKey..........................................................................................230Solutions................................................................................232

    CountingKey..........................................................................................260Solutions................................................................................261

    ProbabilityKey..........................................................................................288Solutions................................................................................289

    Number TheoryKey..........................................................................................308Solutions................................................................................310

    GeometryKey..........................................................................................334Solutions................................................................................336

    7: Appendix.............................................................................................363Useful Lists and Formulas.

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    Table of Contents