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I know all the theory, but I can never score well with the essay questions in paper 2. Why?

As you've probably noticed, the mark scheme is incredibly specific about the terminology that you use. You could describe the process of, say, endocytosis, to great accuracy, but if you don't use the exact k...
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Answered by Amy W. • Biology tutor
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Differentiate: 2(x^2+2)^3

This is a chain rule question. Unlike in ordinary differentiation we have more than just the single term 'x' with coefficient 1 raised to the power of something. e.g. x^3 Therefore, there is more steps. We c...
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Answered by Charlotte A. • Maths tutor
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Sketch the graph of x^2+y^2-6x-4y=23

Firstly, to try and sketch this graph just going on the equation as it is above is a huge task for any maths student. The best way to approach this is to neaten it up with some algebra: -1: x^2+y^2-6x-4y can...
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Answered by Sam A. • Maths tutor
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Integrate the function f(x) = ax^2 + bx + c over the interval [0,1], where a, b and c are constants.

Firstly remember that d/dx(x^n) = nx^(n-1). And so the antiderivative, or integral of x^n, i.e. \int(x^n) = x^(n+1)/(n+1) + C (where C is the integration constant). When integrating with limits, i.e. when we...
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Answered by Anvarbek A. • Maths tutor
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What is classical conditioning?

Classical conditioning is a learning process whereby a stimulus such as food is paired with another neutral stimulus (food) through an association.
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Answered by Fred B. • Psychology tutor
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