• #### Two Column Proofs - Problem 1

##### Math›Geometry›Triangles
How to use a two column proof to show that two triangles are congruent.
• #### Two Column Proofs - Problem 4

##### Math›Geometry›Triangles
How to use a two column proof to show that two sides are congruent with overlapping triangles.
• #### Two Column Proofs - Problem 3

##### Math›Geometry›Triangles
How to use a two column proof to show that two angles are congruent with overlapping triangles.
• #### Two Column Proofs - Problem 2

##### Math›Geometry›Triangles
How to use a two column proof to show that two angles are congruent in a parallelogram with one diagonal.
• #### Overcoming a D or an F during Freshman or Sophomore Year

##### Advice›College counseling›How to get better grades
A video that shows you how to overcome a failing grade during freshman or sophomore year. A college admissions counselor shows you how to improve your grade or retake the class, if necessary.
• #### Two Column Proofs - Concept

##### Math›Geometry›Triangles
How to organize a two column proof.
• #### Basic Polynomial Graphs - Problem 10

##### Math›Algebra 2›Polynomials
Comparing imaginary solutions with real zeros that show up as x-intercepts on a graph.
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• #### Introduction to Logarithms - Problem 3

##### Math›Precalculus›Exponential and Logarithmic Functions
Sample problem that shows how to move equations back and forth from logarithmic to exponential form.
• #### Continuity - Problem 2

##### Math›Calculus›Limits and Continuity
How to show that a function is discontinuous at a point x=a because the limit as x approaches a does not exist.
• #### Concavity and Inflection Points - Concept

##### Math›Calculus›Applications of the Derivative
How to show that a function is discontinuous at a point x=a because it is not defined there.
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None
• #### Continuous Functions - Problem 2

##### Math›Calculus›Limits and Continuity
How to show that rational functions are continuous functions.
• #### Intervals of Increase and Decrease - Problem 1

##### Math›Calculus›Applications of the Derivative
How to use one-sided limits to show that a limit does not exist.
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None
• #### Continuity - Problem 1

##### Math›Calculus›Limits and Continuity
How to show that a function is discontinuous at a point x=a because it is not defined at a. Explanation of continuity.
• #### Significant Figures

##### Science›Chemistry›Introduction to Chemistry
How to find the correct number of figures to show when writing numbers.
• #### Concavity and Inflection Points - Problem 2

##### Math›Calculus›Applications of the Derivative
How to show that a function is discontinuous at a point x=a because its limit and its value at x=a are different.
Tags:
None
• #### Significant Figures

##### Science›Physics›Introduction to Physics
How to find the correct number of figures to show when writing numbers.
• #### Trigonometric Identities - Problem 3

##### Math›Precalculus›Trigonometric Functions
How to use the unit circle to show that sine and cosine have period 2*pi, and tangent has period pi.
• #### Introduction to Logarithms - Problem 3

##### Math›Algebra 2›Inverse, Exponential and Logarithmic Functions
Sample problem that shows how to move equations back and forth from logarithmic to exponential form.
• #### Continuity - Problem 3

##### Math›Calculus›Limits and Continuity
How to show that a function is discontinuous at a point x=a because its limit and its value at x=a are different. Explanation of continuity.
• #### Trigonometric Identities - Problem 3

##### Math›Trigonometry›Trigonometric Functions
How to use the unit circle to show that sine and cosine have period 2*pi, and tangent has period pi.