Investors and financial analysts often rely on the profitability index (PI) to determine whether the benefits of an investment opportunity outweigh its costs. Essentially, the PI compares projected ...

From trigonometry to Pythagoras' theorem, there are plenty of mathematical terms you might remember from school – but could you actually answer a question now? After a survey found half of British ...

For centuries, Pi was thought to be an unchanging constant defined by the circle. Recent mathematical advances have revealed ...