PreCalculus
So it looks like you want to take Calculus, but first you have to survive PreCalculus. No worries, these videos will make understanding functions quick and simple. In fact if you have taken Algebra, some of the topics may be review. Just remember to always keep in mind the domain and range.
Rational Functions
Example  Finding the vertical asymptotes of a rational function Example  Finding the horizontal asymptotes of a rational function Example  Finding the slant asymptote of a rational function Example  Graphing a rational function 
Example  Solving direct variation problems Example  Solving inverse variation problems Example  Solving joint variation problems Example  Solving combined variation problems

Radical Functions
Example  Solving equatons with more than one square root Example  Solving equations with a square root inside a square root Example  Solving higher radicals Example  Finding the zeros of radical functions


Exponential and Logarithmic Functions
Example  Find the inverse of a function
Example  Using the quotient rule Example  Using the power rule Example  Using the change of base formula Example  Expand a Logarithm using the laws Example  Condense a Logarithm using the laws


Trigonometric Functions
Example  Solving a right triangle
Example  Finding the amplitude Example  Finding the phase shift Example  Graphing trigonometric functions 

Trigonometric Identities

Application of Trigonometric Functions
Example  The ambiguous case with the law of sines
Example  Finding the roots of a complex number 
Example  Finding the difference of vectors Example  Finding the magnitude of a vector Example  Finding the dot product
Example  Solving a force diagram 
Conic Sections
Example  How to find the focus Example  How to find the directrix Example  How to graph a parabola Example  Find the equation of a parabola Example  How to find the center Example  How to find the radius Example  Rewriting using complete the square Example  How to graph a circle
Example  How to find the foci Example  How to find the vertices Example  How to graph an ellipse 
Example  How to find the foci Example  How to find the vertices Example  How to find the asymptotes Example  How to graph a hyperbola

Systems of Equations and Matrices
Example  How to solve using substitution Example  How to solve using elimination
Example  How to solve when there are infinite solutions
Example  Partial fraction decomposition 
Example  Solving a linear programming problem in two variables 