# forumula

1. ### Distribution forumula

If we have two cubes and we divide each in seven parts and then each of these seven in three and than those three in eight. What is the general formula for the number of particle we get at the end...
2. ### Derivation of PDF forumula

\frac{P(x_{0} > X > x_{0} + \epsilon)}{\epsilon} \rightarrow f(x_{0}) as \epsilon \rightarrow 0 I'm finding this a bit confusing. I understand that it's supposed to represent that as \epsilon aproaches 0 the probability will be f(x_{0}), I just don't quite understand hwo it's derived...
3. ### Find The forumula for the inverse of a given function

So one problem is f(x)=x^3 , In my head I know its x^(1/3) because y=x^3 Then i think I Do the third square root to both sides to get that answer but am not sure. This is the one where Im haveing the most trouble f(x)=(3x+1)/(2x-5) So I Multipy each side by 2x-5 and get y(2x-5) which factors...
4. ### How do I find the complex roots using the quadratic forumula for 4th degree poly?

For: z^4 + 7z^2 +2 how can I use the quadratic formula to find the complex roots? I tried substituting u = z^2, but when I use the quadratic formula I get real answers and don't know where to substitute u back in. I also tried thinking of the values for a b and c as z^2, 7 and 2, but I cam...
5. ### Question about forumula for weight loss

I was trying to come up with an equation which would calculate a person's weight over time as they add additional exercise. The problem I'm having is that the change in weight is dependent on the current weight. For example, two people at different weights will burn different amounts of...
6. ### Forumula for the product of the first 'n' numbers?

I know that we are able to derive a formula for the sum of the first 'n' positive natural numbers, that sum being: \sum_{i=1}^n i=\frac{(n)(n+1)}{2} I know that we can derive this formula by writing out the sum as S =1+2+ \cdot \cdot \cdot \cdot + (n-1) + (n) and doing some algebraic...