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2. Khan Academy - Wikipedia

   en.wikipedia.org/wiki/Khan_Academy

   Khan Academy is an American non-profit [3] educational organization created in 2006 by Sal Khan. [1] Its goal is to create a set of online tools that help educate students. [4] The organization produces short video lessons. [5] Its website also includes supplementary practice exercises and materials for educators.

3. Sal Khan - Wikipedia

   en.wikipedia.org/wiki/Sal_Khan

   3. Relatives. Abdul Wahab Khan (grandfather) Salman " Sal " Amin Khan (born October 11, 1976) is an American educator and the founder of Khan Academy, a free online non-profit educational platform with which he has produced over 6,500 video lessons teaching a wide spectrum of academic subjects, originally focusing on mathematics and science. [1]

4. 52 Incredibly Cool Things That Are Free Online That Everyone ...

   www.aol.com/52-helpful-things-free-everyone...

   For me, one of the best free things online is educational content from platforms like Khan Academy, Coursera, and edX. You can learn almost anything for free, from coding to art history, at your ...

5. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   In mathematics and computer programming, the order of operations is a collection of rules that reflect conventions about which operations to perform first in order to evaluate a given mathematical expression. These rules are formalized with a ranking of the operations. The rank of an operation is called its precedence, and an operation with a ...

6. Trigonometry - Wikipedia

   en.wikipedia.org/wiki/Trigonometry

   Fourier. v. t. e. Trigonometry (from Ancient Greek τρίγωνον (trígōnon) 'triangle' and μέτρον (métron) 'measure') [1] is a branch of mathematics concerned with relationships between angles and side lengths of triangles. In particular, the trigonometric functions relate the angles of a right triangle with ratios of its side lengths.

7. Khan Academy is an essential homeschooling resource ...

   www.aol.com/khan-academy-essential-homeschooling...

   This year we’re trying out Khan Academy, and logging in is simple. Its contents have been translated into over 36 languages, and it’s run by a team of over 150 people who continue to enhance ...