Question

Limits of exponential help, please?

Answer 1

For the first problem, I suggest you use L'hopital's rule.

Answer 2

Change e^(-x^2) into 1/e^(x^2)

Answer 3

This is the graph of y = f(x) for the second part. As you can see, approaching 4 from the left yields 0, while doing so from the right yields infinity