MathAlien question

BONUS QUESTION: An alien comes to Earth, and discusses mathematics with you. (She is trying to assess our civilization's level of technological advancement.) The alien says: "Suppose that f() is a function defined on some open interval containing c = a. Then f(x ) is said to be continuous at x = a if, for all e > 0, there exists a 6 > 0 such that, if 0