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What is the doctrine of consideration in contract Law, and what was the impact of the case of Williams v Roffey Bros

Doctrine of consideration is based upon the idea of ‘reciprocity’. A promise in contract law should not be enforceable unless the promisee has given something in exchange for the promise (i.e. Remuneration, ...
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Prove the Quotient Rule using the Product Rule and Chain Rule

given that the chain rule is d/dx(f(g(x))) = g'(x)f'(g(x))given that the product rule is d/dx(f(x)g(x)) = f'(x)g(x) + f(x)g'(x)given that the quotient rule is d/dx(f(x)/g(x)) = (g(x)f'(x) - g'(x)f(x))/(g(x))...
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Derive the formula for differentiation from first principles

For a curve of f(x) against x, we can take the general point (x, f(x)) on the curve. By moving horizontally along the x-axis a distance of h, we also have the point (x+h, f(x+h)) on the curve. The gradient o...
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Answered by Nicola G. • Maths tutor
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Circle the number that is closest in value to (1.1)/(0.0204) [From selection of 5, 6, 50, 60] [Edit of 2018 Paper 1 Q4]

To simplify the question, the denominator can be rounded to 0.02 (to find an estimate), which comes out to be 1.1/0.02=55, which suggests that the answer is between 50 and 60, and not the other two.Now, an a...
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Answered by Doug L. • Maths tutor
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What is the difference between ‘a’, ‘à’ and ‘as’?

It may seem confusing at first, but once you know the basics all you need to do is ask yourself what the purpose of the word is in your sentence. ‘A’ functions as the verb in the sentence- it’s a form of the...
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Answered by Sylvia O. • French tutor
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