• #### Rate Word Problems - Concept

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems involving rates of travel, possibly including wind or water current.
• #### Cramer's Rule - Problem 1

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to interpret the results when Cramer's rule fails to yield a solution.
• #### Coin Word Problems - Problem 1

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about values and number of quarters and dimes.
• #### Age Word Problems - Problem 2

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about the ages of two people if given their past ages.
• #### Rate Word Problems - Problem 1

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about airplanes leaving opposite cities and moving toward each other.
• #### Work Word Problems - Problem 2

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems when 2 people are doing a work job together.
• #### Rate Word Problems - Problem 2

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems involving air or water current.
• #### Work Word Problems - Problem 1

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems when 2 people are doing a work job together and there is a fractional answer.
• #### Age Word Problems - Problem 1

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about the ages of two people if given their future ages.
• #### The Identity Matrix - Concept

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to determine the identity matrix of order n.
• #### Area With Determinants - Concept

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the area of a parallelogram using a determinant.
• #### Percent Concentrations - Concept

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems about mixing two liquids with different percent concentrations.
• #### Square Matrices - Problem 1

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to demonstrate that matrix multiplication is not commutative.
• #### Square Matrices - Concept

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to determine whether two matrices can be multiplied, and if so, what the dimensions of the product will be.
• #### The Inverse of a Square Matrix - Concept

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to determine whether two matrices are inverses.
• #### 2x2 Determinants - Concept

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the determinant of a 2x2 square matrix.
• #### The Cross Product of Vectors - Concept

##### Math›Precalculus›Systems of Linear Equations and Matrices
How to compute the cross product of two 3D vectors.
• #### Sum of Digits - Concept

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve a problem when asked to switch the digits of a 2-digit number.
• #### Mixture Problems - Concept

##### Math›Algebra›Word Problems Using Systems of Equations
How to solve word problems when mixing two quantities with different prices.
• #### Rate Word Problems - Problem 5

##### Math›Algebra›Word Problems Using Systems of Equations
Solving for time in a distance = rate times time word problem
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