I'd like to propose a few things if nobody minds.

First of all I'd like to propose the idea that two numbers are opposite if the mean of the two numbers is zero, which is true for 1 and -1.

Secondly, I'd like to say that Yellow Submarine's answer to Asmo's question about speeds at the top of page 4 is wrong, and that it should be 80.

Thirdly, Richie B's prrof on page 2 is false, because No is part of the actual unknown. It's like saying that you can take out half of X to leave <.

Fourthly, on page three Yellow Submarine asks if (a+b)^n=a^n+2ab^n+b^n. I'm afraid that this is not true. However, I have not yet worked out what it is.