Lisaa wrote:
My friend like free question service, but i dont know its name.. He write some question about math and then have an answer.. Maybe its can help me.. What do u think about it?
Sorry Lisaa,
I do not think Khan Academy can help your friend with specific answers.
It teaches you how to solve problems, but it is certainly not a free question service,
.
If your friend finds some time, maybe he/she could look up the area the question originates from, i.e. algebra, trigonometry, calculus, and find an instruction to the principle amongst the videos, which in turn could help to solve his/her problem,
?
Here is a link to the collection of videos on Khan Academy.
Right at the top of the web page you will find 'jump to playlist Math, Science, Humanities, etc.'. If you click on 'Math' it will offer you also a drop down menu to choose from, this might save you some time.
link:
Khan Academy Video Index