Tennessee

Hello Dr. Burns, I am a 69 year old student and this is my last class other than my Senior Project. I have already had a successful career but always wanted to get my degree. I have had Advanced Math before but it has been a long while. I am trying to relearn Algebra. You have done a great job explaining Algebra. I just keep trying to work the problems until I figure out how it was done. I wish that anyone that ever wanted a degree to let them know it is never too late to accomplish their dream.

Texas, but I am currently in Florida.

Your website is beautiful and calming. Thank you for the lessons and resources. I needed a refresher course.

Alberta, Canada

i really love all the content and helpful math content PLUS all the other fun little tidbits about you and what you like (like dancing and cooking!). i love all the hard work you have done :)

illinois

thank you so much! came for graph transformations and plan on staying for much more; amazing resource you\'ve put together! thanks again!!

Massachusetts, moved to the midwest recently

i hope whoever reads this is successful in both their job + academically. keep trying until you succeed!! <3

oregon

yo thanks this helped me last minute for a math test

North Carolina

Heeellllooooooooooooooooooooooooooooo! I really love that there are unlimited precalculus problems. This is incredible.

Socorro, New Mexico

Paraphrasing Pedrotti\'s Optics, it is obvious by Fermat\'s principle and the definition of an ellipse that \"A\" an object placed at one focus of an ellipse will produce an image at the other focus. Also, \"B\", an object placed at one focus of a hyperbola will produce a virtual image
at the other focus. Statement A \"is\" obvious based on definition that ellipse is locus of points such that sum of distances from foci to a point on the ellipse is a constant. Statement \"B\" is not the least bit obvious. You do not use Fermat\'s principle. Instead you use angle of incidence equals angle of reflection ... you produce a real image (by using the \"back\") of the hyperboloid and your result is beautiful. Thank you!!!

iowa, usa

Hello hello

us

😁