Bill -

I discovered your work while struggling to understand some material from an on line Pre-calculus course. I never would have survived without your help.

Thank you!

Mastering a subject makes one... ok. TEACHING it, to others, makes one FANTASTICO. You are fantastico;)

Like math much? haha

hey man your videos are cool as hell man 5 stars,hey man can you please check my: a very bloody animation, its funny tell me what you think of it, thanks

I watched your videos regarding polynomials the day I had a test and I had not studied all weekend. Just stopped by to let you know your videos are so fun and easy to learn. Oh by the way I got an A+.

awesome videos, im having trouble with this question, given the electrical circuit p= 10i - 8i^2 , determine the current i to produce a power of 2.5W in the circuit, JC Aust WA Perth

I am an ole Retired Marine and like some here I stumbled onto your site. You're a fantastic, easy going teacher with a flair that captures the attention of your students as you stand heads and shoulders above your peers. I love the idea that I can replay and take notes to refer to as needed. Your mastery of the subjects and teaching methods are the best I have ever seen.
Thank you so much.

Semper Fi
Ole Sarge USMC Rtd

Very well done videos, I'm impressed.

I am a new math teacher and stumbled onto your wonderful informative videos doing a search engine on graphing inequalities...WOW your videos are phenomenal! I have shown them to my classes and look forward to viewing more of your great math videos....Thanks!!

Thank you so much for posting your videos. I was struggling with factoring polynomials for about three weeks. I tried asking my teacher for help, visiting my college tutoring lab and searching online for help. I wasn't until I watched your videos that things finally sunk in. You're a great man I wish my Math teacher was more like you!