Functions:
-
basic concept, linear functions:
https://ergosumus.wordpress.com/wp-content/uploads/2017/10/math_lesson_plan18_intro_linear_functions_20170828.pdf parabolas (quadratic functions):
https://ergosumus.wordpress.com/wp-content/uploads/2017/10/parabola42-en.pdf
"cogitamus ergo sumus" 