common 42 videos

Adaptive Radiation
Biology Evolution
The fast evolution of species with a common ancestor.
adaptive variation 
Unit System
Physics Introduction to Physics
The definition of the unit system and common prefixes.
unit system unit prefix deka hecto kilo 
Solving Equations with fractions and decimals by "Clearing"
PreAlgebra Solving Equations and Inequalities
Solving equations with fractions by multiplying by the least common multiple

Volume and Surface Area
PreAlgebra Introductory Geometry
Vocabulary and formulas for surface area and volume of common solids

Campaigns and Elections
AP US Government AP US Government Videos
How are candidates chosen to run for office? In what ways could the election process be reformed?
Common backgrounds of recent presidents the electoral college 
Factoring: Special Cases Part II
Algebra Factoring
How to factor a third degree polynomial by grouping.
factoring by grouping greatest common factor binomial 
Solving Rational Equations with Like Denominators
Algebra Rational Expressions and Functions
How to solve rational equations by clearing the denominator.
clearing the denominator common denominator excluded value 
Arithmetic Sequences
Algebra 2 Sequences and Series
How to find the general term of an arithmetic sequence.
arithmetic sequence common difference general term 
Arithmetic Sequences
Precalculus Sequences and Series
How to find the general term of an arithmetic sequence.
arithmetic sequence common difference general term 
Nouns
Grammar Parts of Speech
The different types of nouns and how to use them.
nouns common proper concrete abstract collective compound 
Simple Substitutions
Calculus Antiderivatives and Differential Equations
How to use the method of substitution to avoid common integration mistakes.
antidifferentiation method of substitution change of variables derivatives differential 
Graphs with Holes
Precalculus Polynomial and Rational Functions
How to graph a rational function when there is a common factor in the numerator and denominator
rational functions factors holes 
Factoring Trinomials, a is not 1
Algebra Factoring
How to factor trinomials when the leading coefficient is not one.
ax^2 + bx + c greatest common factor FOIL 
Properties of Logarithms
Precalculus Exponential and Logarithmic Functions
How to evaluate logarithms when the argument is a recognizable power of the base.
logarithmic functions exponential functions inverse functions identities the common logarithm 
Adding and Subtracting Rational Expressions
Algebra 2 Rational Expressions and Functions
How to add and subtract rational expressions.
rational expressions adding subtracting lcd least common denominator factoring 
Solving a Rational Equation
Algebra 2 Rational Expressions and Functions
How to solve a simple rational equation.
cross multiplying fraction factoring denominator least common denominator lcd check 
Solving a Rational Equation for a parameter
Algebra 2 Rational Expressions and Functions
How to solve a simple rational equation for a parameter.
rational equation parameter variable lcd least common denominator 
Rotational Symmetry
Geometry Transformations
How to define rotational symmetry and identify the degree of rotational symmetry of common regular polygons.
symmetry rotation point symmetry image equilateral triangle