Functions and Common Core
http://www.dpi.state.nc.us/docs/acre/standards/common-core/standards-k-12.pdf
Exponential Functions
https://www.youtube.com/watch?v=UQMa5ZSxoYc
https://www.youtube.com/watch?v=HLJmspocwnU
http://jwilson.coe.uga.edu/EMAT6680Fa09/Wagner/assignment1/assignment1.html
https://www.mathsisfun.com/sets/function-exponential.html
www.emathhelp.net
Linear Functions
http://www.mathsisfun.com/algebra/linear-equations.html
https://www.youtube.com/watch?v=WW_InNRM-d0
https://www.youtube.com/watch?v=NBdtKR3btvs
http://www.columbia.edu/itc/sipa/math/linear.html
http://www.britannica.com/topic/linear-equation
Quadratic functions
http://www-history.mcs.st-and.ac.uk/HistTopics/Quadratic_etc_equations.html
https://www.youtube.com/watch?v=VcI_jXaBHXc
https://www.mathsisfun.com/algebra/quadratic-equation.html
https://www.mathsisfun.com/algebra/quadratic-equation-real-world.html
http://www.drdelmath.com/special_topics/function/functions_quadratic_properties.htm
http://webspace.ship.edu/deensley/m100/ws3.html
http://cdn.kutasoftware.com/Worksheets/Alg1/Graphing%20Quadratic%20Functions.pdf
Square Root Functions
https://www.youtube.com/watch?v=ap6O6fsgbqI
http://www.mathsisfun.com/sets/function-square-root.html
http://hotmath.com/hotmath_help/topics/graphing-square-root-functions.html
https://johncarlosbaez.wordpress.com/2011/12/02/babylon-and-the-square-root-of-2/
http://www.mesacc.edu/~scotz47781/mat120/notes/radicals/domain/square_root/square_roots_practice.html
https://www.youtube.com/watch?v=PEtIQqvIoGU