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Inversely proportional means proportional to one over, so the first bit tells us y = a/d^2, where a is number we don't know yet that connects y and d. To find it we need some example values of y and d, wh...

These are two arbitrage relations expected to hold in an international setting where capital can flow freely between different countries. In particular, the two conditions arise when investors can choose ...

The following risk factors are associated with CHD: smoking, blood pressure, diet, exercise, genetic influences. Smoking systemically affects the whole cardiovascular system, some ...

To factorise you need to identify 'factors', which are common features, between the different terms in an equation. In 3a^2 - 9a, the first term is 3a^2 and the second term is -9a. One common feature betw...