Progressão Aritmética = Arithmetic Progression, that is no more than an aritmetic sequence. The latter, a list of numbers where each number is equal to the previous number, plus a constant (called common reference - in Portuguese "razão").
It´s considered as "general series" at WolframMathWorld (a site dedicated to Maths, languages, codes etc.)
http://www.mathportal.org/calculators/s ... ulator.php
Função Quadrática - Quadratic Function. "Is a function or mathematical expression of degree two. This means that the highest power of the function is two."
Its graph is parabola-shaped. That is, aproximately U-shapped (an mirror-symmetrical curve).
http://study.com/academy/lesson/quadrat ... -quiz.html
http://www.csun.edu/~ayk38384/notes/mod ... bolas.html