Critical Numbers & Critical Points of Functions (Intro)

Interact with the following applet for a few minutes. [br]Then, answer the question that follows. [br][br]
KEY QUESTION:
What does it mean for a number [i]c[/i] to be defined as a [color=#38761d][b]CRITICAL NUMBER[/b][/color] of a function [i]f[/i]?
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Information: Critical Numbers & Critical Points of Functions (Intro)