I know I should remember this from high school geometry, but what's the simplest curve that is crosses (0,0) and (as x increases) rises to be asymptotic to a horizontal line? (I'm not sure whether I want an inflection point or not -- I'm just trying to convert an open-ended number into a bounded "score".)
I've got to say that you guys are a lot easier to deal with than the Stack Overflow crowd. I've come in with two "dumb" questions and gotten considerate answers in both cases. Much appreciated!!