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'Rationalise the denominator' means that we need to express the fraction in a way which does not have a surd on the bottom. A surd is a way of expressing an irrational number. For example √4 = 2 which is ...

The alveoli in the lungs have a high surface area to volume ratio that provide a higher rate of diffusion. They have very thin walls which are one cell thick that allow fast gaseous exchange between the a...

There are three main ways to find the roots of a quadratic and they all have different benefits.Firstly, suppose your equation is in the form ax^2 + bx + c where a,b,c are all real numbers. Then you could...

(a) If the sequence = p , 5p-8 and 3p+8 is an arithmetic sequence then the difference between successive terms must be constant.e.g. (5p-8)-(p) = (3p+8)-(5p-8)=> 4p-8 = -2p+16 => 6p = 24 => p=24/...

The answer should reach a judgement on how accurate it is to say that Stalin’s use of terror in the 1930s was fundamentally similar to Lenin’s use of terror in the years 1918–24. The introduction might ou...