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f''(x) means that we need to differentiate the function f(x) twice (f'(x) would mean we need to do it once). Differentiation means we multiply the coefficient by the power, and subtract one from the power...

When a number is raised to a power, that means the number is multiplied by itself. The power (the small number) shows how many times we need to multiply the big number by itself. Therefore: 2^3 can be spl...

The first thing to look at is l2 and l1 being perpendicular. This means the gradients of the two lines multiplied together = -1 . To determine the gradient a student could differentiate l1 but a slightly ...

Although there are several examples that suggest Elizabeth I was sometimes out of control of her parliament, the assessment that she was ‘never’ in control can be questioned. Over the course of her reign ...

The recent changes in monetary policy, which is the manipulation of monetary variables such as the Bank of England base rate and the amount of liquidity in commercial and retail banks to influence the lev...