1. The problem statement, all variables and given/known data Find the limit and any horizontal asymptotes: lim 4/(e-x) x→∞ 2. Relevant equations Principle 1: A limit defines a horizontal asymptote whenever x→∞ or x→-∞. Principle 2: If a limit goes to ∞ or -∞, there won't be a horizontal asymptote. 3. The attempt at a solution lim 4/(e-x) = ∞ x→∞ since as x gets bigger, ex also gets bigger. Horizontal Asymptote = 0 Given the above answer, if correct, then I have a problem with the two above principles I learned. Should I email my professor about these two principles? I am trying to learn these first before I do the actual homework. Thanks!