3b: the result is an overflow?
3c: what does it mean to derive machine epsilon?
For 3c, E has to be in F. But is that true in general? What if E is not in F?

5a: "what range...", I've found that ranges close to 0 are bad, how close is close enough?
5b: in general, what are some "hints" for how to algebraically rearrange to reduce error?