Does anyone know any websites that help teach pre-calculus?

I have a pre-calculus question... So if someone out there is smart with math could you give me a lil help... the question is....

I'm having trouble finding dialects? So if anybody knows.. Could you please help me out. Thankss. I only need like 2 or 3

I am in the 10th grade doing 12th grade math and my teacher wont even help me on it. So can anyone help me?? PLEASE

does anyone know some homework help sites that offer assistance for college students in cell biology also known as general bi...

Does anyone know how long does it take to study dental hygine to be a dental hyginest.

Website that help my to learn other languages and improve my english language...

For example, with the improvement in technology and culture and stuff? Please help, i have to write an extended essay on this...

...i had 2 paragraph and i dont know what to write? its for my econmoic class iand i just dont know what to say how to start....

is there a way to take the GED test online for free. or a practice test online for free. anyone knows a direct link???

I am doing power point for a class about Border Bookstore and it's franchise and I cannot find all the information I need. Ca...