Explore the concept of functions by putting values into this machine and observing its output.
http://nlvm.usu.edu/en/nav/frames_asid_191_g_3_t_2.html
Stop that Creature
Figure out the function to shut down the machines
http://pbskids.org/cyberchase/math-games/stop-creature/
patterns, relationships and functions.
http://www2.smarttutor.com/player/swf/Algebra_Functions_L3_V1_T4a.swf