Is it possible for two different estimates of the same sum both to be reasonable?

Answer 1

Yup! Estimate sqrt(2)+(pi). Some people say 3 digits after a decimal is enough, some would say 15, but nobody would say countably infinite. We don't know enough digits of either to do it. And never will. So, if you come up with two estimates, they may both be reasonable.

Answer 2

sure, one can be a little low and one can be a little high

Answer 3

i would think so