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What are some good revision strategies?

Everyone has their own ways of remembering things, but there are some good general points that might help you out. If you just read over things, you might find that you can’t remember much at the end of a se...
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Answered by Gyda F. • Biology tutor
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How do new species evolve?

Allopatric speciation: New species appear when one interbreeding population is split into two reproductively isolated populations, which then evolve to become separate species. This mostly happens when popul...
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Answered by Gyda F. • Biology tutor
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What is the difference between a composite (cone) volcano and a shield volcano?

Composite cone volcanoes are made out of alternate layers of magma and ash deposits whereas shiled volcanoes consist mainly of magma deposits only. composite cone volcanoes are also steeper sided whereas shi...
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Answered by Bethany R. • Geography tutor
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What is the gradient of the function f(x) = 2x^2 + 3x - 7 at the point where x = -2?

To work out the gradient of a function f(x), we need to differentiate it with respect to x, to give us f'(x). If x = a at a point, then the gradient of f(x) at that point is f'(a) (substitute a in place of x...
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Answered by Jake J. • Maths tutor
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If n is an integer such that n>1 and f(x)=(sin(n*x))^n, what is f'(x)?

Let us denote sin(nx) = u(x), where u is a function of x. The equation is now therefore f(x) =(u(x))^n. For simplicity, we will write that as f(x) = u^n By the chain rule, we know that f'(x) = df/dx = (df/du...
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Answered by Noam T. • Maths tutor
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