f(2009+0) = 2009 +f(0) = 2011. I arrived a few seconds after michy, but I agree with him.

5 Answers · Science & Mathematics · 19/02/2009

Commutativity: with

**real**numbers: x + y = y + x. The order of the addition is not important...2 Answers · Science & Mathematics · 21/08/2008

Left Distributive Property of Multiplication over Addition

1 Answers · Science & Mathematics · 01/02/2013

...a nice proof. Suppose that r and s are

**two real**numbers, and without loss of generality, suppose that...0. Because of the "Archimedian property " of the integers, we can find an integer q...4 Answers · Science & Mathematics · 15/02/2013

...work, you could simply let x and y be any

**two**points in your set ... a continuous interval subset of the**real**numbers, then clearly (x+y)/2 will... arbitrary then the in-between property is satisfied. Edit...1 Answers · Science & Mathematics · 05/05/2013

### create a quadratic function with a minimum point,

**two**positive**real**roots, and a y-intercept of 12.?...multiply by 6 and get y = 6(x-1)(x-2) for a quadratic function with

**two real**roots and y-intercept 12. It opens upward... y = (x-3)(x-4) which has all the required**properties**without adjustment.1 Answers · Science & Mathematics · 28/09/2010

f(2009) = f(2009 + 0) = 2009 + f(0) = 2009 + 2 = 2011.

1 Answers · Science & Mathematics · 16/10/2009

... on the "Archimedian property " of the

**real**numbers. That is: for... between a and b. For the second part, do the same proof for**real**numbers b...2 Answers · Science & Mathematics · 19/09/2012

... the expression. #4. Density property The density property tells us that we can always find another

**real**number that lies between any**two real**numbers. For example, between 5.61 and 5.62, there...1 Answers · Science & Mathematics · 04/08/2007

...y < 1/x. Obviously 3 < 4, so from the second property 1/4 < 1/3, From the first property , -1/4 > -1/3...

3 Answers · Science & Mathematics · 12/08/2011