Reciprocity failure

[Leigh]

When I see an increasing rate of change, I think of differential calculus not multiplication.

Oh WOW! Calculus! Is that supposed to intimidate us? Sorry... it doen't.

Who mentioned rate of change? Nobody but you.
This is not a rate of change problem in the first place, which is why nobody else mentioned it.
Your comment just emphasizes your total lack of understanding of the underlying subject.

I should go out a shoot some film, and not waste my time with you lot.

That's a marvelous idea. In the process, you can quit wasting our time.

- Leigh