Precalculus Online Course


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Thinkwell's Precalculus with Professor Edward Burger

A 2-for-1 value: Thinkwell's Precalculus online course combines concepts from College Algebra with Trigonometry for a comprehensive experience of precalculus mathematics. Our Precalculus has hundreds of video tutorials and thousands of automatically graded exercises with step-by-step feedback, covering everything in the most popular textbooks, so you have all of the pre-calculus math help you need to prepare for Calculus.

Thinkwell's Precalculus video tutorials feature award-winning teacher Edward Burger, who has a unique ability to break down concepts and explain examples in ways that stick with students.

The Precalculus Workbook (optional) comes with lecture notes, sample problems, and exercises so that you can study even when away from the computer.  You can read reviews of our math courses here.

Course Features

Video Lessons

356 engaging 5-10 minute video lessons
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Lesson Plan

Detailed, 36-week lesson plan and schedule
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Automatically graded exercises and tests
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Notes & Sample Problems

Illustrated course notes, sample problems & solutions
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What Parents Are Saying. . .
"My 7th grader started extra-homework with Thinkwell pre-algebra a few years ago. He is now in Thinkwell's pre-calculus class. He loves the videos, on-line quizzes with instant grading. His regular school math is so easy for him.”
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"I used Thinkwell once before when studying Precalculus and was well pleased with how Professor Edward Burger explains math concepts. I am struggling with Geometry, so I decided to take his course. I have been able to understand the concepts of Geometry that stumped me before.”
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Course Overview

what you get

  • 12-month, online subscription to our complete Precalculus course
  • 36-week, day-by-day course lesson plan
  • 350+ course lessons, each with a streaming video
  • Automatically graded drill-and-practice exercises with step-by-step answer feedback
  • Sample problems and solutions
  • Chapter & Practice tests, a Midterm & Final Exam
  • Animated interactivities....and more!

How It Works

  • Purchase Thinkwell's Precalculus through our online store
  • Create an account username and password which will give you access to the online Precalculus course section
  • Activate your 12-month subscription when you're ready
  • Login to the course website to access the online course materials, including streaming video lessons, exercises, quizzes, tests and more
  • Access your course anytime, anywhere, from any device
  • Your work is automatically tracked and updated in real-time
  • Grade reports and certificates of completion are available at request
About Thinkwell's Precalculus Author, Edward Burger

Learn from award-winning mathematician Dr. Edward Burger

It's like having a world-class college professor right by your side teaching you Precalculus.

  • "Global Hero in Education" by Microsoft Corporation
  • "America's Best Math Teacher" by Reader's Digest
  • Robert Foster Cherry Award Winner for Great Teaching
Thinkwell's Precalculus Table of Contents
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1. Basic Algebra Review

1.1 Introduction
1.1.1 The Top Ten List of Mistakes
1.2 Inequalities
1.2.1 Concepts of Inequality
1.2.2 Inequalities and Interval Notation
1.3 Absolute Value
1.3.1 Properties of Absolute Value
1.3.2 Evaluating Absolute Value Expressions
1.4 Exponents
1.4.1 An Introduction to Exponents
1.4.2 Evaluating Exponential Expressions
1.4.3 Applying the Rules of Exponents
1.4.4 Evaluating Expressions with Negative Exponents
1.5 Converting between Notations
1.5.1 Converting between Decimal and Scientific Notation
1.5.2 Converting Rational Exponents and Radicals
1.6 Radical Expressions
1.6.1 Simplifying Radical Expressions
1.6.2 Simplifying Radical Expressions with Variables
1.6.3 Rationalizing Denominators
1.7 Polynomial Expressions
1.7.1 Determining Components and Degree
1.7.2 Adding, Subtracting, and Multiplying Polynomials
1.7.3 Multiplying Big Products
1.7.4 Using Special Products
1.8 Factoring
1.8.1 Factoring Using the Greatest Common Factor
1.8.2 Factoring by Grouping
1.8.3 Factoring Trinomials Completely
1.8.4 Factoring Trinomials: The Grouping Method
1.9 Factoring Patterns
1.9.1 Factoring Perfect Square Trinomials
1.9.2 Factoring the Difference of Two Squares
1.9.3 Factoring the Sums and Differences of Cubes
1.9.4 Factoring by Any Method
1.10 Rational Expressions
1.10.1 Rational Expressions and Domain
1.10.2 Working with Fractions
1.10.3 Writing Rational Expressions in Lowest Terms
1.11 Working with Rationals
1.11.1 Multiplying and Dividing Rational Expressions
1.11.2 Adding and Subtracting Rational Expressions
1.11.3 Rewriting Complex Fractions
1.12 Complex Numbers
1.12.1 Introducing and Writing Complex Numbers
1.12.2 Rewriting Powers of i
1.12.3 Adding and Subtracting Complex Numbers
1.12.4 Multiplying Complex Numbers
1.12.5 Dividing Complex Numbers

2. Equations and Inequalities

2.1 Linear Equations
2.1.1 An Introduction to Solving Equations
2.1.2 Solving a Linear Equation
2.1.3 Solving a Linear Equation with Rationals
2.1.4 Solving a Linear Equation That Has Restrictions
2.2 Word Problems with Linear Equations: Math Topics
2.2.1 An Introduction to Solving Word Problems
2.2.2 Solving for Perimeter
2.2.3 Solving a Linear Geometry Problem
2.2.4 Solving for Consecutive Numbers
2.2.5 Solving to Find the Average
2.3 Word Problems with Linear Equations: Applications
2.3.1 Solving for Constant Velocity
2.3.2 Solving a Problem about Work
2.3.3 Solving a Mixture Problem
2.3.4 Solving an Investment Problem
2.3.5 Solving Business Problems
2.4 Quadratic Equations: Some Solution Techniques
2.4.1 Solving Quadratics by Factoring
2.4.2 Solving Quadratics by Completing the Square
2.4.3 Completing the Square: Another Example
2.5 Quadratic Equations and the Quadratic Formula
2.5.1 Proving the Quadratic Formula
2.5.2 Using the Quadratic Formula
2.5.3 Predicting the Type of Solutions Using the Discriminant
2.6 Quadratic Equations: Special Topics
2.6.1 Solving for a Squared Variable
2.6.2 Finding Real Number Restrictions
2.6.3 Solving Fancy Quadratics
2.7 Word Problems with Quadratics: Math Topics
2.7.1 An Introduction to Word Problems with Quadratics
2.7.2 Solving a Quadratic Geometry Problem
2.7.3 Solving with the Pythagorean Theorem
2.7.4 The Pythagorean Theorem: Another Example
2.8 Word Problems with Quadratics: Applications
2.8.1 Solving a Motion Problem
2.8.2 Solving a Projectile Problem
2.8.3 Solving Other Problems
2.9 Radical Equations
2.9.1 Determining Extraneous Roots
2.9.2 Solving an Equation Containing a Radical
2.9.3 Solving an Equation with Two Radicals
2.9.4 Solving an Equation with Rational Exponents
2.10 Variation
2.10.1 An Introduction to Variation
2.10.2 Direct Proportion
2.10.3 Inverse Proportion
2.11 Solving Inequalities
2.11.1 An Introduction to Solving Inequalities
2.11.2 Solving Compound Inequalities
2.11.3 More on Compound Inequalities
2.11.4 Solving Word Problems Involving Inequalities
2.12 Inequalities: Quadratics
2.12.1 Solving Quadratic Inequalities
2.12.2 Solving Quadratic Inequalities: Another Example
2.13 Inequalities: Rationals and Radicals
2.13.1 Solving Rational Inequalities
2.13.2 Solving Rational Inequalities: Another Example
2.13.3 Determining the Domains of Expressions with Radicals
2.14 Absolute Value
2.14.1 Matching Number Lines with Absolute Values
2.14.2 Solving Absolute Value Equations
2.14.3 Solving Equations with Two Absolute Value Expressions
2.14.4 Solving Absolute Value Inequalities
2.14.5 Solving Absolute Value Inequalities: More Examples

3. Relations and Functions

3.1 Graphing Basics
3.1.1 Using the Cartesian System
3.1.2 Thinking Visually
3.2 Relationships between Two Points
3.2.1 Finding the Distance between Two Points
3.2.2 Finding the Second Endpoint of a Segment
3.3 Relationships among Three Points
3.3.1 Collinearity and Distance
3.3.2 Triangles
3.4 Circles
3.4.1 Finding the Center-Radius Form of the Equation of a Circle
3.4.2 Decoding the Circle Formula
3.4.3 Finding the Center and Radius of a Circle
3.4.4 Solving Word Problems Involving Circles
3.5 Graphing Equations
3.5.1 Graphing Equations by Locating Points
3.5.2 Finding the x- and y-Intercepts of an Equation
3.6 Function Basics
3.6.1 Functions and the Vertical Line Test
3.6.2 Identifying Functions
3.6.3 Function Notation and Finding Function Values
3.7 Working with Functions
3.7.1 Determining Intervals Over Which a Function Is Increasing
3.7.2 Evaluating Piecewise-Defined Functions for Given Values
3.7.3 Solving Word Problems Involving Functions
3.8 Function Domain and Range
3.8.1 Finding the Domain and Range of a Function
3.8.2 Domain and Range: One Explicit Example
3.8.3 Satisfying the Domain of a Function
3.9 Linear Functions: Slope
3.9.1 An Introduction to Slope
3.9.2 Finding the Slope of a Line Given Two Points
3.9.3 Interpreting Slope from a Graph
3.9.4 Graphing a Line Using Point and Slope
3.10 Equations of a Line
3.10.1 Writing an Equation in Slope-Intercept Form
3.10.2 Writing an Equation Given Two Points
3.10.3 Writing an Equation in Point-Slope Form
3.10.4 Matching a Slope-Intercept Equation with Its Graph
3.10.5 Slope for Parallel and Perpendicular Lines
3.11 Linear Functions: Applications
3.11.1 Constructing Linear Function Models of Data
3.11.2 Linear Cost and Revenue Functions
3.12 Graphing Functions
3.12.1 Graphing Some Important Functions
3.12.2 Graphing Piecewise-Defined Functions
3.12.3 Matching Equations with Their Graphs
3.13 The Greatest Integer Function
3.13.1 The Greatest Integer Function
3.13.2 Graphing the Greatest Integer Function
3.14 Quadratic Functions: Basics
3.14.1 Deconstructing the Graph of a Quadratic Function
3.14.2 Nice-Looking Parabolas
3.14.3 Using Discriminants to Graph Parabolas
3.14.4 Maximum Height in the Real World
3.15 Quadratic Functions: The Vertex
3.15.1 Finding the Vertex by Completing the Square
3.15.2 Using the Vertex to Write the Quadratic Equation
3.15.3 Finding the Maximum or Minimum of a Quadratic
3.15.4 Graphing Parabolas
3.16 Manipulating Graphs: Shifts and Stretches
3.16.1 Shifting Curves along Axes
3.16.2 Shifting or Translating Curves along Axes
3.16.3 Stretching a Graph
3.16.4 Graphing Quadratics Using Patterns
3.17 Manipulating Graphs: Symmetry and Reflections
3.17.1 Determining Symmetry
3.17.2 Reflections
3.17.3 Reflecting Specific Functions
3.18 Composite Functions
3.18.1 Using Operations on Functions
3.18.2 Composite Functions
3.18.3 Components of Composite Functions
3.18.4 Finding Functions That Form a Given Composite
3.18.5 Finding the Difference Quotient of a Function
3.18.6 Calculating the Average Rate of Change

4. Polynomial and Rational Functions

4.1 Polynomials: Long Division
4.1.1 Using Long Division with Polynomials
4.1.2 Long Division: Another Example
4.2 Polynomials: Synthetic Division
4.2.1 Using Synthetic Division with Polynomials
4.2.2 More Synthetic Division
4.3 The Remainder Theorem
4.3.1 The Remainder Theorem
4.3.2 More on the Remainder Theorem
4.4 The Factor Theorem
4.4.1 The Factor Theorem and Its Uses
4.4.2 Factoring a Polynomial Given a Zero
4.5 The Rational Zero Theorem
4.5.1 Presenting the Rational Zero Theorem
4.5.2 Considering Possible Solutions
4.6 Zeros of Polynomials
4.6.1 Finding Polynomials Given Zeros, Degree, and One Point
4.6.2 Finding all Zeros and Multiplicities of a Polynomial
4.6.3 Finding the Real Zeros for a Polynomial
4.6.4 Using Descartes' Rule of Signs
4.6.5 Finding the Zeros of a Polynomial from Start to Finish
4.6.6 The Fundamental Theorem of Algebra
4.6.7 The Conjugate Pair Theorem
4.7 Graphing Simple Polynomial Functions
4.7.1 Matching Graphs to Polynomial Functions
4.7.2 Sketching the Graphs of Basic Polynomial Functions
4.7.3 Graphing Polynomial Functions: Another Example
4.8 Rational Functions
4.8.1 Understanding Rational Functions
4.8.2 Basic Rational Functions
4.9 Graphing Rational Functions
4.9.1 Vertical Asymptotes
4.9.2 Horizontal Asymptotes
4.9.3 Graphing Rational Functions
4.9.4 Graphing Rational Functions: More Examples
4.9.5 Oblique Asymptotes
4.9.6 Oblique Asymptotes: Another Example

5. Exponential and Logarithmic Functions

5.1 Function Inverses
5.1.1 Understanding Inverse Functions
5.1.2 The Horizontal Line Test
5.1.3 Are Two Functions Inverses of Each Other?
5.1.4 Graphing the Inverse
5.2 Finding Function Inverses
5.2.1 Finding the Inverse of a Function
5.2.2 Finding the Inverse of a Function with Higher Powers
5.3 Exponential Functions
5.3.1 An Introduction to Exponential Functions
5.3.2 Graphing Exponential Functions: Useful Patterns
5.3.3 Graphing Exponential Functions: More Examples
5.4 Applying Exponential Functions
5.4.1 Using Properties of Exponents to Solve Exponential Equations
5.4.2 Finding Present Value and Future Value
5.4.3 Finding an Interest Rate to Match Given Goals
5.5 The Number e
5.5.1 e
5.5.2 Applying Exponential Functions
5.6 Logarithmic Functions
5.6.1 An Introduction to Logarithmic Functions
5.6.2 Converting between Exponential and Logarithmic Functions
5.7 Solving Logarithmic Functions
5.7.1 Finding the Value of a Logarithmic Function
5.7.2 Solving for x in Logarithmic Equations
5.7.3 Graphing Logarithmic Functions
5.7.4 Matching Logarithmic Functions with Their Graphs
5.8 Properties of Logarithms
5.8.1 Properties of Logarithms
5.8.2 Expanding a Logarithmic Expression Using Properties
5.8.3 Combining Logarithmic Expressions
5.9 Evaluating Logarithms
5.9.1 Evaluating Logarithmic Functions Using a Calculator
5.9.2 Using the Change of Base Formula
5.10 Applying Logarithmic Functions
5.10.1 The Richter Scale
5.10.2 The Distance Modulus Formula
5.11 Solving Exponential and Logarithmic Equations
5.11.1 Solving Exponential Equations
5.11.2 Solving Logarithmic Equations
5.11.3 Solving Equations with Logarithmic Exponents
5.12 Applying Exponents and Logarithms
5.12.1 Compound Interest
5.12.2 Predicting Change
5.13 Word Problems Involving Exponential Growth and Decay
5.13.1 An Introduction to Exponential Growth and Decay
5.13.2 Half-Life
5.13.3 Newton's Law of Cooling
5.13.4 Continuously Compounded Interest

6. The Trigonometric Functions

6.1 Angles and Radian Measure
6.1.1 Finding the Quadrant in Which an Angle Lies
6.1.2 Finding Coterminal Angles
6.1.3 Finding the Complement and Supplement of an Angle
6.1.4 Converting between Degrees and Radians
6.1.5 Using the Arc Length Formula
6.2 Right Angle Trigonometry
6.2.1 An Introduction to the Trigonometric Functions
6.2.2 Evaluating Trigonometric Functions for an Angle in a Right Triangle
6.2.3 Finding an Angle Given the Value of a Trigonometric Function
6.2.4 Using Trigonometric Functions to Find Unknown Sides of Right Triangles
6.2.5 Finding the Height of a Building
6.3 The Trigonometric Functions
6.3.1 Evaluating Trigonometric Functions for an Angle in the Coordinate Plane
6.3.2 Evaluating Trigonometric Functions Using the Reference Angle
6.3.3 Finding the Value of Trigonometric Functions Given Information about the Values of Other Trigonometric Functions
6.3.4 Trigonometric Functions of Important Angles
6.4 Graphing Sine and Cosine Functions
6.4.1 An Introduction to the Graphs of Sine and Cosine Functions
6.4.2 Graphing Sine or Cosine Functions with Different Coefficients
6.4.3 Finding Maximum and Minimum Values and Zeros of Sine and Cosine
6.4.4 Solving Word Problems Involving Sine or Cosine Functions
6.5 Graphing Sine and Cosine Functions with Vertical and Horizontal Shifts
6.5.1 Graphing Sine and Cosine Functions with Phase Shifts
6.5.2 Fancy Graphing: Changes in Period, Amplitude, Vertical Shift, and Phase Shift
6.6 Graphing Other Trigonometric Functions
6.6.1 Graphing the Tangent, Secant, Cosecant, and Cotangent Functions
6.6.2 Fancy Graphing: Tangent, Secant, Cosecant, and Cotangent
6.6.3 Identifying a Trigonometric Function from its Graph
6.7 Inverse Trigonometric Functions
6.7.1 An Introduction to Inverse Trigonometric Functions
6.7.2 Evaluating Inverse Trigonometric Functions
6.7.3 Solving an Equation Involving an Inverse Trigonometric Function
6.7.4 Evaluating the Composition of a Trigonometric Function and Its Inverse
6.7.5 Applying Trigonometric Functions: Is He Speeding?
7. Trigonometric Identities

7. Basic Trigonometric Identities

7.1 Basic Trigonometric Identities
7.1.1 Fundamental Trigonometric Identities
7.1.2 Finding All Function Values
7.2 Simplifying Trigonometric Expressions
7.2.1 Simplifying a Trigonometric Expression Using Trigonometric Identities
7.2.2 Simplifying Trigonometric Expressions Involving Fractions
7.2.3 Simplifying Products of Binomials Involving Trigonometric Functions
7.2.4 Factoring Trigonometric Expressions
7.2.5 Determining Whether a Trigonometric Function Is Odd, Even, or Neither
7.3 Proving Trigonometric Identities
7.3.1 Proving an Identity
7.3.2 Proving an Identity: Other Examples
7.4 Solving Trigonometric Equations
7.4.1 Solving Trigonometric Equations
7.4.2 Solving Trigonometric Equations by Factoring
7.4.3 Solving Trigonometric Equations with Coefficients in the Argument
7.4.4 Solving Trigonometric Equations Using the Quadratic Formula
7.4.5 Solving Word Problems Involving Trigonometric Equations
7.5 The Sum and Difference Identities
7.5.1 Identities for Sums and Differences of Angles
7.5.2 Using Sum and Difference Identities
7.5.3 Using Sum and Difference Identities to Simplify an Expression
7.6 Double-Angle Identities
7.6.1 Confirming a Double-Angle Identity
7.6.2 Using Double-Angle Identities
7.6.3 Solving Word Problems Involving Multiple-Angle Identities
7.7 Other Advanced Identities
7.7.1 Using a Cofunction Identity
7.7.2 Using a Power-Reducing Identity
7.7.3 Using Half-Angle Identities to Solve a Trigonometric Equation

8. Applications of Trigonometry

8.1 The Law of Sines
8.1.1 The Law of Sines
8.1.2 Solving a Triangle Given Two Sides and One Angle
8.1.3 Solving a Triangle (SAS): Another Example
8.1.4 The Law of Sines: An Application
8.2 The Law of Cosines
8.2.1 The Law of Cosines
8.2.2 The Law of Cosines (SSS)
8.2.3 The Law of Cosines (SAS): An Application
8.2.4 Heron's Formula
8.3 Vector Basics
8.3.1 An Introduction to Vectors
8.3.2 Finding the Magnitude and Direction of a Vector
8.3.3 Vector Addition and Scalar Multiplication
8.4 Components of Vectors and Unit Vectors
8.4.1 Finding the Components of a Vector
8.4.2 Finding a Unit Vector
8.4.3 Solving Word Problems Involving Velocity or Forces
8.5 Complex Numbers in Trigonometric Form
8.5.1 Graphing a Complex Number and Finding Its Absolute Value
8.5.2 Expressing a Complex Number in Trigonometric or Polar Form
8.5.3 Multiplying and Dividing Complex Numbers in Trigonometric or Polar Form
8.6 Powers and Roots of Complex Numbers
8.6.1 Using DeMoivre's Theorem to Raise a Complex Number to a Power
8.6.2 Roots of Complex Numbers
8.6.3 More Roots of Complex Numbers
8.6.4 Roots of Unity
8.7 Polar Coordinates
8.7.1 An Introduction to Polar Coordinates
8.7.2 Converting between Polar and Rectangular Coordinates
8.7.3 Converting between Polar and Rectangular Equations
8.7.4 Graphing Simple Polar Equations
8.7.5 Graphing Special Polar Equations

9. Systems of Equations and Matrices

9.1 Linear Systems of Equations
9.1.1 An Introduction to Linear Systems
9.1.2 Solving a System by Substitution
9.1.3 Solving a System by Elimination
9.2 Linear Systems of Equations in Three Variables
9.2.1 An Introduction to Linear Systems in Three Variables
9.2.2 Solving Linear Systems in Three Variables
9.2.3 Solving Inconsistent Systems
9.2.4 Solving Dependent Systems
9.2.5 Solving Systems with Two Equations
9.3 Applying Linear Systems
9.3.1 Investments
9.3.2 Solving with Partial Fractions
9.3.3 Partial Fractions: Another Example
9.4 Nonlinear Systems
9.4.1 Solving Nonlinear Systems Using Elimination
9.4.2 Solving Nonlinear Systems by Substitution
9.5 Matrices
9.5.1 An Introduction to Matrices
9.5.2 The Arithmetic of Matrices
9.5.3 Multiplying Matrices by a Scalar
9.5.4 Multiplying Matrices
9.6 Solving Systems Using the Gauss-Jordan Method
9.6.1 Using the Gauss-Jordan Method
9.6.2 Using Gauss-Jordan: Another Example
9.6.3 Using the Gauss-Jordan Method with Three Equations
9.6.4 Gaussian Elimination with Three Equations
9.7 Evaluating Determinants
9.7.1 Evaluating 2x2 Determinants
9.7.2 Evaluating nxn Determinants
9.7.3 Evaluating a Determinant Using Elementary Row Operations
9.7.4 Finding a Determinant using Expanding by Cofactors
9.7.5 Applying Determinants
9.8 Cramer's Rule
9.8.1 Using Cramer's Rule
9.8.2 Using Cramer's Rule in a 3x3 Matrix
9.9 Inverses and Matrices
9.9.1 An Introduction to Inverses
9.9.2 Inverses: 2x2 Matrices
9.9.3 Another Look at 2x2 Inverses
9.9.4 Inverses: 3x3 Matrices
9.9.5 Solving a System of Equations with Inverses
9.10 Working with Inequalities
9.10.1 An Introduction to Graphing Linear Inequalities
9.10.2 Graphing Linear and Nonlinear Inequalities
9.10.3 Graphing the Solution Set of a System of Inequalities
9.11 Linear Programming
9.11.1 Solving for Maxima-Minima
9.11.2 Applying Linear Programming

10. Special Topics

10.1 Conic Sections: Parabolas
10.1.1 An Introduction to Conic Sections
10.1.2 An Introduction to Parabolas
10.1.3 Determining Information about a Parabola from Its Equation
10.1.4 Writing an Equation for a Parabola
10.2 Conic Sections: Ellipses
10.2.1 An Introduction to Ellipses
10.2.2 Finding the Equation for an Ellipse
10.2.3 Applying Ellipses: Satellites
10.2.4 The Eccentricity of an Ellipse
10.3 Conic Sections: Hyperbolas
10.3.1 An Introduction to Hyperbolas
10.3.2 Finding the Equation for a Hyperbola
10.3.3 Applying Hyperbolas: Navigation
10.4 Conic Sections
10.4.1 Identifying a Conic
10.4.2 Name That Conic
10.4.3 Rotation of Axes
10.4.4 Rotating Conics
10.5 The Binomial Theorem
10.5.1 Using the Binomial Theorem
10.5.2 Binomial Coefficients
10.5.3 Finding a Term of a Binomial Expansion
10.6 Sequences
10.6.1 General and Specific Terms
10.6.2 Understanding Sequence Problems
10.6.3 Series Notation, Definitions and Evaluating
10.6.4 Solving Problems Involving Arithmetic Sequences
10.6.5 Finding the Sum of an Arithmetic Sequence
10.6.6 Solving Problems Involving Geometric Sequences
10.6.7 Finding the Sum of a Geometric Sequence
10.7 Induction
10.7.1 Proving Formulas Using Mathematical Induction
10.7.2 Examples of Induction
10.8 Combinations and Probability
10.8.1 Solving Problems Involving Permutations
10.8.2 Solving Problems Involving Combinations
10.8.3 Independent Events
10.8.4 Inclusive and Exclusive Events
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Most of the exercises are multiple choice and they are graded automatically with correct answer solutions.

Is Thinkwell's Precalculus Math built on "continuous review?"

Thinkwell's Precalculus is carefully constructed to build on previous knowledge, reinforcing key concepts every step of the way. It is not only a reflection of empirically effective instruction, but also reflects Dr Burger’s philosophies learned over a career of teaching mathematics, emphasizing a solid foundation that addresses why students need to learn certain concepts. Finally, Thinkwell Precalculus is intentionally designed to work for a wide variety of learning styles.

What is Thinkwell's Refund Policy?

We offer a full refund of 12-month subscription purchases within 14 days of purchase, no questions asked. For Essential Review courses, the refund period is 3 days. Optional printed materials are printed on demand and the sales are final.

How does my school review this course?

Should your school need to review a Thinkwell course for any reason, have the school contact and we can provide them access to a demo site.

Do I get credits for a Thinkwell course?

Generally, only schools can award credits, and Thinkwell is not a school. We can provide you with a certificate of completion and a grade report. However, if you’re pursuing credit with a particular school or institution, it might be helpful to know that Thinkwell math courses are accredited by the Western Association of Schools and Colleges (WASC) as a Supplementary Education Program. For California students, Thinkwell is also an approved A-G online publisher. Learn more about our accreditation HERE.

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