Show the mathematical relationship between Relative Risk and Difference in

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Show the mathematical relationship between Relative Risk and Difference in Conditional Proportions. (Work the formulas algebraically so RR is on one side of the equation and the difference (plus some other values that can be calculated using A, B, C, and D) are on the other.)

I'm totally stuck on finding the relationship, RR and Diff are easy enough to find, but I'm not sure what other values to include to find a meaningful relationship between the 2.
 
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Please post what you have for RR and Diff, preferably with working.
 

Thread 'Finding the nth roots of a complex number'

There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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