Khan Academy
Khan Academy: Trigonometry: Iit Jee Trigonometry Problem 1
Video demonstrates simplifying a trigonometric expression relating unknown sides and angles of a triangle by using trigonometric identities. [15:13]
Khan Academy
Khan Academy: Biology: Review of B Cells, Cd4+ T Cells and Cd8+ T Cells
A summary of all the major players in the specific immune system. [11:07]
Khan Academy
Khan Academy: Statistics: Anova 3 Hypothesis Test With F Statistic
Video demonstrates how to calculate an F-statistic and use the F-distribution to determine whether to accept or reject a null hypothesis. [10:14]
Khan Academy
Khan Academy: Algebra: X and Y Intercepts
This video demonstrates how to find the x and y intercepts given a linear equation. Once the intercepts are found it also shows how to graph the line on a coordinate plane. Practice problems available. [4:08]
Khan Academy
Khan Academy: Linear Algebra: Determinant of a Transpose
Video demonstrating that the determinant of a matrix is equivalent to the determinant of the transpose of a matrix. Proof by induction is used to prove this property. [14:10]
Khan Academy
Khan Academy: Linear Algebra: Another Example of a Projection Matrix
A video lesson working another example for finding the projection of an arbitrary vector onto a specific subspace in R3. The basis of the subspace is a 3 x 2 matrix. Uses an alternate method for find the transformation matrix that...
Khan Academy
Khan Academy: Algebra: Addition and Subtraction With Significant Figures
Video showing how to add and subtract numbers using significant figures. Contrasts adding and subtracting with significant figures with multiplying and dividing. [8:59]
Khan Academy
Khan Academy: Algebra: Scientific Notation 3
Video solving an application problem where numbers in scientific notation need to be divided. Includes link to additional practice at the top of the video. [6:21]
Khan Academy
Khan Academy: Algebra: Equations 2
This video demonstrates how to solve equations of the form Ax + B=C. There are two indepth examples that also demonstrate how to add and subtract positive and negative integers. Practice problems available. [8:41]
Khan Academy
Khan Academy: Algebra: Quadratic Formula 3
Explains how to determine the number of solutions a quadratic equation has based on the value of the discriminant. [4:59]
Khan Academy
Khan Academy: Algebra: Scientific Notation Example 2
Video multiplying two numbers in scientific notation. Includes brief review of what scientific notation is and a link to additional practice. [5:23]
Khan Academy
Khan Academy: Algebra: Testing Solutions for a System of Inequalities
This video demonstrates how to take a given point and test if it is a solution for a system of inequalities by using substitution. [1:15]
Khan Academy
Khan Academy: Trigonometry: Trigonometric System Example
Video demonstrates solving for all possible values of theta for a trigonometric system of three equations. [11:02]
Khan Academy
Khan Academy: Algebra: u.s. Customary and Metric Units
An introductory video introducing the U.S. customary and metric units and which units measure length, mass, and volume. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [5:10]
Khan Academy
Khan Academy: Algebra: Solving Systems by Elimination 2
This video demonstrates how to solve a system of linear equations by eliminating a variable. The given system is of two equations in two variables. [3:45]
Khan Academy
Khan Academy: Algebra: Multiplying Binomials With Radicals
Video demonstrates how to multiply two polynomials when each polynomial contains one variable term and one radical (constant) term. [6:03]
Khan Academy
Khan Academy: Chemistry: Orbitals
A detailed discussion of the probability functions around the nuclei of atoms, otherwise known as orbitals. [13:37]
Khan Academy
Khan Academy: Linear Algebra: Orthogonal Matrices Preserve Angles and Lengths
Video lesson about how orthogonal matrices preserve lengths and angles of vectors when multiplied. Preservation of lengths is shown by manipulating the length of the square of an orthogonal matrix times a vector and preservation of...
Khan Academy
Khan Academy: Algebra: Proof: A(log B) = Log (B^a), Log a Log B = Log (A/b)
Shows a proof of the logarithm power property and the property that division inside the log can be turned into subtraction outside the log. [7:58]
Khan Academy
Khan Academy: Differential Equations:repeated Roots of Characteristic Equation 2
Video shows example of solving a second order linear homogeneous differential equation when the characteristic equation has repeated roots. Includes using initial conditions to find a particular solution. [8:52]
Khan Academy
Khan Academy: Geometry: Heron's Formula
Demonstrates how to find the area of a triangle using Heron's formula. Practice problems available. [4:43]
Khan Academy
Khan Academy: Geometry: Point Line Distance and Angle Bisectors
Proof that a point on the angle bisector is equidistant from each side of the angle and proof that a point that is equidistant from each side of the angle lies on the angle bisector. [10:57]
Khan Academy
Khan Academy: Algebra: Absolute Value Inequalities Example 2
A step-by-step video explaining how to solve and graph all possible values of an absolute value inequality and test the solution set. [4:38]
Khan Academy
Khan Academy: Geometry: Triangle Area Proofs
Proof that the area of any triangle is half the product of the base and the height. Three different types of triangles are used to prove the formula. [10:23]