# the number line   139 videos

• #### The Discriminant

How to calculate and interpret the discriminant of a quadratic equation.

discriminant x intercepts number of solutions
• #### Significant Figures

##### PhysicsIntroduction to Physics

How to find the correct number of figures to show when writing numbers.

significant figures digits rounding
• #### Significant Figures

##### ChemistryIntroduction to Chemistry

How to find the correct number of figures to show when writing numbers.

significant figures digits rounding
• #### Graphing Equations by Making a Table of Values

##### Pre-AlgebraGraphing in Two Dimensions

Graphing a line by making a table of values

• #### The Euler Formula

##### PrecalculusPolar Coordinates and Complex Numbers

How to use the Euler Formula to convert a complex number from the exponential form to rectangular form.

complex numbers trigonometric form Euler formula e sine cosine modulus argument
• #### Solving a Quadratic Inequality using a Sign Chart

##### Algebra 2Quadratic Equations and Inequalities

How to solve a quadratic inequality using a sign chart.

sign number line sign chart less than greater than quadratic inequality
• #### Rays

##### GeometryGeometry Building Blocks

How to identify, define, and label rays and opposite rays.

ray line endpoint opposite rays
• #### Finding the Slope of a Line from 2 Points

##### AlgebraLinear Equations and Their Graphs

How to find the slope if you're given 2 points.

slope point ratio
• #### Permutations

##### PrecalculusTopics in Discrete Math

How to find the number of permutations of a set.

different arrangement permutation factorial permute
• #### Combinations

##### PrecalculusTopics in Discrete Math

How to find the number of combinations of a set.

chose choosing combination order doesn't matter pens
• #### Permutations

##### Algebra 2Combinatorics

How to find the number of permutations of a set.

different arrangement permutation factorial permute
• #### Combinations

##### Algebra 2Combinatorics

How to find the number of combinations of a set.

chose choosing combination order doesn't matter pens
• #### Cube Roots

How to find the cube root of a number.

cube root
• #### Defining Variables

##### AlgebraPre-Algebra

How to write variables to describe numbers.

variable
• #### Pronoun Antecedent Agreement

##### GrammarSentence Basics

The rules for pronoun and antecedent agreement.

pronoun antecedent agreement person number gender
• #### Point-Slope Form of Linear Equations

##### AlgebraLinear Equations and Their Graphs

How to write the equation of a line in point-slope form.

slope equation