Question 2*In the epsilon-delta definition, which quantity is chosen first: \(\epsilon\) or \(\delta\)?
Question 8**+For \(f(x)=5-2x\), find \(\delta\) in terms of \(\epsilon\) to prove \(\lim_{x\to1}f(x)=3\).
Question 12***+A function satisfies \(f(x)=2x+1\) for \(x\ne1\), but \(f(1)=100\). What is \(\lim_{x\to1}f(x)\), and why?
Question 16****+For \(\lim_{x\to a}cx=ca\), where \(c\ne0\), find a suitable \(\delta\) in terms of \(\epsilon\).
Question 17****+A proof chooses \(\delta=\epsilon^2\) to prove \(\lim_{x\to0}x=0\). Does it work for every \(\epsilon>0\)? Explain.
Question 19*****Explain why the order \(\forall\epsilon>0\,\exists\delta>0\) cannot be swapped in the formal definition of a limit.