Imaginary numbers: http://www.math.toronto.edu/mathnet/answers/imaginary.html

 

Finding the inverse of matrices:  http://www.maths.soton.ac.uk/~jav/soton/MATH1007/workbook_7/7_4_inv_mtrx.pdf

 

Geoboard paper:  http://mason.gmu.edu/~mmankus/Handson/geobrds.htm

 

Geoboard simulation:  http://nlvm.usu.edu/en/nav/frames_asid_282_g_3_t_3.html?open=activities

 

Graph paper:  http://www.incompetech.com/graphpaper/plain/

 

Math vocabulary index:  http://www.nscollegeprep.cps.k12.il.us/ncphs/depts/math/ralbritton/files/general/vocab%20welcome%20page.htm

 

Math dictionary:  http://www.blc.edu/fac/rbuelow/common/glossarya-m.htm