Khan Academy
Khan Academy: Algebra: Direct Variation 1
Video solving a direct variation problem about amounts of gas and the cost of filling up a car. Includes link to additional practice at the top of the video. [3:39]
Khan Academy
Khan Academy: Algebra: Patterns and Equations
This video has several problems that deal with writing equations. The first problem illustrates how to write an equation to represent the relationship between variables in a table. The rest of the sample problems demonstrate how to take...
Khan Academy
Khan Academy: Geometry: Introduction to the Pythagorean Theorem
This video tutorial [8:35] identifies the parts of a right triangle and demonstrates how to use the Pythagorean Theorem to determine an unknown side length of a right triangle.
Khan Academy
Khan Academy: Trigonometry: 2003 Aime Ii Problem 11
Video demonstrates solving a trigonometric problem that includes finding the area of an oblique triangle using the Pythagorean Theorem and the law of cosines [16:35]
Khan Academy
Khan Academy: Pre Calculus: Compound Interest and E (Part 3)
Another segment in the series on compound interest and the number e from the Khan Academy. This video begins to derive the formula for interest compounded continuously (A=Pe^rt). Limits are employed to show that the limit of the interest...
Khan Academy
Khan Academy: Algebra: Pythagorean Theorem 3
The video tutorial lesson [3:00] demonstrates the solving the width of a rectangular carpet by using the Pythagorean theorem, given the length and the diagonal of the rectangle.
Khan Academy
Khan Academy: Pre Calculus: Interest (Part 2)
A continuation of the video Introduction to Interest also from the Khan Academy. This segment develops formulas for both simple and compound interest using the variables P, r and t. After each of the formulas are derived, they are used...
Khan Academy
Khan Academy: Algebra: Evaluate a Formula Using Substitution
A video that demonstrates how to substitute variables in order to evaluate a formula. The formula is given in the example. [1:15]
Khan Academy
Khan Academy: Geometry: Area of a Parallelogram
Demonstrates how to derive the formula for the area of parallelogram based on the area formula for a triangle. [5:42]
Khan Academy
Khan Academy: Algebra: Negative Exponent Intuition
Video lesson explaining negative and zero exponents by looking at a pattern as exponents are decreased by one. [4:38]
Khan Academy
Khan Academy: Algebra: Exponent Properties 2
Video simplifying an algebraic expression using the quotient of powers and product of powers rules. [5:11]
Khan Academy
Khan Academy: Algebra 1: Absolute Value Inequalities Example 1
A step-by-step video explaining how to solve and graph all possible values of an absolute value inequality. This video also appears in the strand Algebra: Absolute Value. [3:26]
Khan Academy
Khan Academy: Algebra: Quadratic Equations in Standard Form
Identifies the standard form of a quadratic equation and models how to put a given quadratic equation into standard form, ax^2 + bx + c = 0, and identify the values of a, b, and c. [2:21]
Khan Academy
Khan Academy: Algebra: Quotient of Functions
Video finding the quotient of two quadratic functions and then simplifying by factoring. [6:18]
Khan Academy
Khan Academy: Geometry: Area of Inscribed Equilateral Triangle (Basic Trig Used)
Demonstrates how to find the area of an equilateral triangle inscribed in a circle by applying the area formula for a circle and Heron's formula. Some basic trigonometry (SOHCAHTOA) is also used. [11:38]
Khan Academy
Khan Academy: Pre Calculus: Compound Interest and E (Part 4)
In this culminating segment in the video series about compound interest and e, the formula for interest being compounded continuously is fully derived. Examples are then given on how to use the formula for different types of interest...
Khan Academy
Khan Academy: Geometry: Circumcenter of a Right Triangle
Proves that the circumcenter of a right triangle is the midpoint of the hypotenuse. [5:42]
Khan Academy
Khan Academy: Algebra: Solving One Step Equations
This video demonstrates how to solve a one-step equation using addition and subtraction. It also shows how to check the answer by plugging it back into the equation. [1:54]
Khan Academy
Khan Academy: Interesting Perimeter and Area Problems
Demonstrates how to solve three different area and perimeter problems which appear to not have enough information to solve. [8:13]
Khan Academy
Khan Academy: Geometry: Sum of the Exterior Angles of Convex Polygon
Demonstrates how to determine that the exterior angle sum of a convex polygon is 360 degrees. Practice problems available. [5:24]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Place Value 2
This video shows how to write a number in the hundred millions in standard form from a description. Practice problems are available. [4:09]
Khan Academy
Khan Academy: Algebra: Interpreting Inequalities
A step-by-step video demonstrating how to solve an algebraic word problem through interpreting inequalities. [6:39]
Khan Academy
Khan Academy: Statistics: Normal Distribution Problems: Z Score
Video gives examples of calculating z-scores for a problem when the mean and standard deviation are given. Includes link to practice problems. [7:48]
Khan Academy
Khan Academy: Geometry: Proof Vertical Angles Are Equal
Proof that the measures of vertical angles are equal based on properties of supplementary angles. [4:51]