Khan academy Definition and 74 Threads

Here's a picture of the question: This is a Khan Academy question and although I could just click on hint to find out what the answer is, I think it would be helpful to still ask this here before looking at the answer over there, so that I know what I did wrong. Thank you in advance to anyone...

Hi PF, I hope y'all had a great Thanksgiving. Quick question, as I've mentioned before, I am non-traditional college student who is right at just over College Algebra/beginning Trig level in Math. While I am out of university, to make enough money to return, I am wanting to CLEP...

Homework Statement A rod of length D sits at rest on a friction less table. A ball of mass M strikes the end of the rod with a speed V and rebounds with a speed 3v/4 causing the rod to rotate counterclockwise around a fixed axis at one end. The rotational inertia of the rod is I Homework...

Hello, PhysicsForums. Right now, I am studying high school mathematics on Khan Academy, and it is working out great! I also read all of the articles and do the excersizes and I write down everything that I see. I feel that I will achieve mastery of Algebra, Geometry, and Trigonometry in no time...

I am confused. A man named Sal Khan founded the Khan Academy to help struggling students around the globe academically online. Sal had a job making over $100,000 a year and decided to quit his job to teach math online for free. Question: Is Sal a genius? Why is it that certain people in life...

Learn what variables, expressions, and equations really are. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/alg...

A solution to an equation makes that equation true. Learn how to test if a certain value of a variable makes an equation true. Practice this lesson yourself ...

The example of a scale where we try to achieve balance helps to explain why we do the same thing to both sides of an equation. Practice this lesson yourself ...

Equations are about relationships (no, not girlfriends and boyfriends!) between the two sides of the equation. Let's again use a scale example to help us und...

This equation can be simplified through a single step to solve for the variable. Can you help? Practice this lesson yourself on KhanAcademy.org right now: ht...

Let's get a conceptual understanding of why one needs to divide both sides of an equation to solve for a variable. Watch the next lesson: https://www.khanaca...

Learn how to solve one-step addition and subtraction equations by adding or subtracting the same thing from both sides of the equation. Watch the next lesson...

Learn how to solve this equation: a + 5 = 54 Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-lin...

Learn how to solve one-step addition and subtraction equations that have fractions and decimals in them. Practice this lesson yourself on KhanAcademy.org rig...

Let's ease into this, shall we? Here's an introduction to basic algebraic equations of the form ax=b. Remember that you can check to see if you have the righ...

Remember that what you do to one side, you have to do to the other. Will you multiply or divide both sides to dump the fraction, x/a? Let's do it together. P...

"Learn how to solve equations in one step by multiplying or dividing a number from both sides. These problems involve decimals and fractions. Practice this l...

Here's how we solve a two step equation. It begins with the concept of equality: what we do to one side of the equation must be done to the other. Watch the ...

This example demonstrates how we solve an equation expressed such: ax + b = c. It's a little more complicated than previous examples, but you can do it! Prac...

Solve the equation by isolating the term with numerator x. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algeb...

"Learn how to construct and solve a basic linear equation to solve a word problem. Practice this lesson yourself on KhanAcademy.org right now: https://www.kh...

Here's a nifty word problem in which we find the dimensions of a garden given only the perimeter. Let's create an equation to solve! Practice this lesson you...

Learn how to solve a word problem by writing an equation to model the situation. In this video, we use the linear equation 210(t-5) = 41,790. Practice this l...

Watch the next lesson: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/why-of-algebra/v/why-we-do-the-same-thing-to-both-s...

Sal solves the equation 2x + 3 = 5x - 2. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-linear-...

Solving Equations 2 Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequal...

Sal solves the equation (3/4)x + 2 = (3/8)x - 4 using the distributive property Practice this lesson yourself on KhanAcademy.org right now: https://www.khana...

Turning a non-linear equation into a linear one. Watch the next lesson: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/co...

Solving Equations with the Distributive Property Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving...

Equation Special Cases Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-ineq...

Equation Special Cases Watch the next lesson: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/solutions-linear-equations/v...

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/solutions-line...

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/solutions-line...

The sum of 4 consecutive odd integers is 136. What are the 4 integers? Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.or...

Sum of Consecutive Odd Integers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/algebra/solving-linear-equations...

Mixture problems 2 Watch the next lesson: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/More-equation-practice/v/basic-r...

Mixture problems 3 Watch the next lesson: https://www.khanacademy.org/math/algebra/solving-linear-equations-and-inequalities/old-school-equations/v/order-of-...

Linear equations with unknown coefficients

The general idea behind the word 'abstract' Watch the next lesson: https://www.khanacademy.org/math/algebra/introduction-to-algebra/overview_hist_alg/v/the-b...

Why the abstraction of mathematics is so fundamental Watch the next lesson: https://www.khanacademy.org/math/algebra/introduction-to-algebra/overview_hist_al...

Bridging algebra and geometry. What makes linear equations so linear. Watch the next lesson: https://www.khanacademy.org/math/algebra/introduction-to-algebra...

Jesse Roe and Sal Khan talk about why we use letters in algebra Watch the next lesson: https://www.khanacademy.org/math/algebra/introduction-to-algebra/varia...

Our focus here is understanding that a variable is just a symbol that can represent different values in an expression. We got this. Just watch. Watch the nex...

Great question. In algebra, we do indeed avoid using the multiplication sign. We'll explain it for you here. Watch the next lesson: https://www.khanacademy.o...

Learn how to evaluate an expression with variables using a technique called substitution (or "plugging in"). Watch the next lesson: https://www.khanacademy.o...

We've done a few examples together where we were faced with 1 variable. Why not try one that has 2 variables? Practice this lesson yourself on KhanAcademy.or...

Learn how to evaluate expressions that have two different variables in them by using a technique called substitution (or "plugging in"). Practice this lesson...

In this example we have a formula for converting Celsius temperature to Fahrenheit. Let's substitute the variable with a value (Celsius temp) to get the degr...

In this example of evaluating expressions, we're dusting off some geometry. On top of that, it's a word problem. We're seeing how different concepts in math ...

We're going to put our order of operations knowledge to work as we evaluate this expression. Exponents, specifically, are our focus here. Watch the next less...