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2013 AMC 10 A

from Khan Academy (Free)

2D divergence theorem

from Khan Academy (Free)

Using Green's theorem (which you should already be familiar with) to establish that the "flux" through the boundary of a region is equal to the double integral of the divergence...

2D divergence theorem

from Khan Academy (Free)

A system for solving the King's problems

from Khan Academy (Free)

Whether in the real world or a cliche fantasy one, systems of equations are key to solving super-important issues like "the make-up of change in a troll's pocket" or "how can order...

About pi and tau

from Khan Academy (Free)

When you want to make a circle, how is it done? Well you probably will start with the radius one.

Absolute and relative maxima and minima

from Khan Academy (Free)

Absolute and relative maxima and minima

from Khan Academy (Free)

Absolute value

from Khan Academy (Free)

You'll find absolute value absolutely straightforward--it is just the "distance from zero". If you have a positive number, it is its own absolute value. If you have a negative...

Absolute value

from Khan Academy (Free)

Absolute value

from Khan Academy (Free)

Absolute value equations

from Khan Academy (Free)

You are absolutely tired of not knowing how to deal with equations that have absolute values in them. Well, this tutorial might help.

Adding and multiplying polynomials

from Khan Academy (Free)

"Polynomials" sound like a fancy word, but you just have to break down the root words. "Poly" means "many". So we're just talking about "many nomials" and everyone knows what a...

Adding and multiplying polynomials

from Khan Academy (Free)

Adding and subtracting decimals

from Khan Academy (Free)

You get the general idea of decimal is and what the digits in different places represent (place value). Now you're ready to do something with the decimals. Adding and subtracting...

Adding and subtracting decimals

from Khan Academy (Free)

Adding and subtracting fractions

from Khan Academy (Free)

You've already got 2 cups of sugar in the cupboard. Your grandmother's recipe for disgustingly-sweet-fudge-cake calls for 3 and 1/3 cups of sugar. How much sugar do you need to...

Adding and subtracting fractions

from Khan Academy (Free)

Adding and subtracting fractions

from Khan Academy (Free)