• #### Substituting and Evaluating - Problem 1

##### Math›Pre-Algebra›Polynomials
Evaluating polynomials for given values, multiple variables
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• #### HL - Problem 3

##### Math›Geometry›Triangles
How to solve for a variable to make two right triangles congruent using the HL shortcut.
• #### Solving Proportions - Problem 1

##### Math›Geometry›Similarity
How to solve a proportion with a variable on both sides.
• #### Formulas - Problem 1

##### Math›Pre-Algebra›Solving Equations and Inequalities
Solving distance = rate times time or area of a triangle equations for one of the variables
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• #### Adding and Subtracting - Problem 2

##### Math›Pre-Algebra›Whole Numbers
Using opposite operations to solve for a variable in a one-step equation
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• #### Prime Factorization - Problem 4

##### Math›Pre-Algebra›Prime Numbers
Finding greatest common factor of monomials that have variables
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• #### Arithmetic Sequences - Problem 5

##### Math›Precalculus›Sequences and Series
Finding arithmetic means between two terms with variables.
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• #### Adding and Subtracting Polynomials - Problem 3

##### Math›Pre-Algebra›Polynomials
Adding or subtracting polynomials with multiple variables
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• #### Function Notation - Problem 2

##### Math›Algebra 2›Functions
Overview of function notation as a method for substituting, including integer or variable inputs.
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• #### Cube Roots - Problem 1

Simplifying cube roots with integers and variables in the radicand.
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• #### Linear Inequalities - Problem 1

##### Math›Algebra›Solving and Graphing Inequalities
Reading inequality statements with the variable first
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• #### Arithmetic Sequences - Problem 5

##### Math›Algebra 2›Sequences and Series
Finding arithmetic means between two terms with variables.
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• #### Angles - Problem 2

##### Math›Pre-Algebra›Introductory Geometry
Using the definition of supplementary or complementary angles to solve for a variable
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• #### Solving Linear Equations - Concept

##### Math›Precalculus›Linear Equations and Inequalities
How to solve a linear equation in one variable.
• #### The Method of Substitution - Concept

##### Math›Calculus›Antiderivatives and Differential Equations
How to evaluate an indefinite integral using the method of substitution.
• #### Simple Substitutions - Concept

##### Math›Calculus›Antiderivatives and Differential Equations
How to use the method of substitution to avoid common integration mistakes.
• #### Solving Linear Equations - Concept

##### Math›Algebra 2›Linear Equations
How to solve a linear equation in one variable.
• #### Scatterplots and Correlations - Problem 1

##### Math›Algebra›Introduction to Statistics
How to find the correlation of two variables from a scatterplot.
• #### Greatest Common Factors - Problem 8

##### Math›Algebra›Factoring
Finding the greatest common factors of monomials that include both integers and variables.
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