Alg2/Trig: Don't get hung up on Piecewise defined functions and Greatest Integer Functions. For right now be you need to be able to identify them and know what they look like. Think big picture, can you differentiate between different families of functions (ie, linear, quadratic, absolute value, etc.)? There are many resources available to help solidify your understanding of these more abstract topics check out the following links.
http://www.unitedti.org/lofiversion/index.php/t7447.html
http://mathbits.com/MathBits/TISection/Algebra2/absolutevalue.htm
http://mathforum.org/workshops/sum98/participants/glazer/phone/phone.html
http://faculty.kutztown.edu/schaeffe/Tutorials/Piecewise_Functions/piecewise.html
http://www.youtube.com/watch?v=-gwffMEr8i8
http://frank.mtsu.edu/~ebouldin/piece.html
Many of the topics we discuss are just a Google search away. Using technology can be a great way to gain different perspectives or learn about the applications of many of these topics. The internet is also a great way to stay connected to the class if you are out sick.
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