the number line 139 videos

The Discriminant
Algebra Quadratic Equations and Functions
How to calculate and interpret the discriminant of a quadratic equation.
discriminant x intercepts number of solutions 
Significant Figures
Physics Introduction to Physics
How to find the correct number of figures to show when writing numbers.
significant figures digits rounding 
Significant Figures
Chemistry Introduction 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
PreAlgebra Graphing in Two Dimensions
Graphing a line by making a table of values

The Euler Formula
Precalculus Polar 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 2 Quadratic 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
Geometry Geometry 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
Algebra Linear Equations and Their Graphs
How to find the slope if you're given 2 points.
slope point ratio 
Permutations
Precalculus Topics in Discrete Math
How to find the number of permutations of a set.
different arrangement permutation factorial permute 
Combinations
Precalculus Topics in Discrete Math
How to find the number of combinations of a set.
chose choosing combination order doesn't matter pens 
Permutations
Algebra 2 Combinatorics
How to find the number of permutations of a set.
different arrangement permutation factorial permute 
Combinations
Algebra 2 Combinatorics
How to find the number of combinations of a set.
chose choosing combination order doesn't matter pens 
Cube Roots
Algebra Radical Expressions and Equations
How to find the cube root of a number.
cube root 

Pronoun Antecedent Agreement
Grammar Sentence Basics
The rules for pronoun and antecedent agreement.
pronoun antecedent agreement person number gender 
PointSlope Form of Linear Equations
Algebra Linear Equations and Their Graphs
How to write the equation of a line in pointslope form.
slope equation 
Addition and Subtraction with Decimals
PreAlgebra Decimals and Percents
Adding or subtracting decimals by vertically lining up the zeros