• #### Conditional Probability - Problem 1

##### Math›Precalculus›Topics in Discrete Math
How to find the conditional probability of an event from a symbolic definition.
• #### Continuous Functions - Problem 2

##### Math›Calculus›Limits and Continuity
How to show that rational functions are continuous functions.
• #### 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.
• #### 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.
• #### Habitat Destruction

##### Science›Biology›Conservation Biology
The definition and examples of habitat destruction.
• #### Continuous Functions - Concept

##### Math›Calculus›Limits and Continuity
How to determine whether a function f(x) is continuous everywhere on its domain.
• #### Midpoints and Congruent Segments - Problem 1

##### Math›Geometry›Geometry Building Blocks
How to use the definition of a midpoint to solve for side lengths.
• #### The Derivative Function - Problem 1

##### Math›Calculus›The Derivative
How to use the definition of the derivative to find a formula for the derivative function.
• #### The Number e and the Natural Logarithm - Concept

##### Math›Precalculus›Exponential and Logarithmic Functions
How the number e is defined.
• #### 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.
• #### Active Voice and Passive Voice

##### English›Grammar›Voice and Style
Definition and examples of active and passive voice.
• #### The Number e and the Natural Logarithm - Problem 3

##### Math›Precalculus›Exponential and Logarithmic Functions
How to change any exponential function to base e.
• #### Evaluating Limits Algebraically, Part 1 - Concept

##### Math›Calculus›Limits and Continuity
How to evaluate the limit of a function using continuity.
• #### Logarithmic Functions - Problem 1

##### Math›Precalculus›Exponential and Logarithmic Functions
How to graph two logarithmic functions when one graph is a reflection of the other.
• #### Continuous Functions - Problem 3

##### Math›Calculus›Limits and Continuity
How to show that compositions of continuous functions are continuous functions by checking continuity rules for the composition.
• #### Continuous Functions - Problem 1

##### Math›Calculus›Limits and Continuity
How to show that polynomial functions are continuous functions by checking the properties of continuous functions.
• #### Evaluating Sine and Cosine at Other Special Angles - Concept

##### Math›Precalculus›Trigonometric Functions
How to measure the sine and cosine of 150.
• #### Evaluating Limits Algebraically, Part 1 - Problem 1

##### Math›Calculus›Limits and Continuity
How to evaluate the limit of a function using continuity and whether or not a function is continuous at the evaluated point.
• #### Evaluating Limits Algebraically, Part 1 - Problem 2

##### Math›Calculus›Limits and Continuity
How to evaluate the limit of a function using continuity.
• #### The Number e and the Natural Logarithm - Problem 2

##### Math›Precalculus›Exponential and Logarithmic Functions
How to evaluate natural logarithms of e to a power.