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What is a limit

a limit is concerned with how a funciton behaves very close to a certain point. it is written simply as limf(x) = A, x>a this means as x approaches a, f(x) equals A
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Answered by Tom H. • Maths tutor
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How does the exchange rate mechanism affect aggregate demand in the UK?

The exchange rate is defined as the value of one currency against another. Aggregate demand (AD) comprises of consumption, government spending, investment and exports minus imports. A fall in the value of a ...
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Answered by Tom H. • Economics tutor
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What are the oxidation numbers of each element in these examples: a) H2SO4 b) N2 c) NH4+

a) H 2 SO 4 ANSWER: H: +1 S: +6 O: -2 b) N 2 ANSWER: N: 0 (all elements not within a compound have an oxidation number of 0 eg I 2 , O 2 , K) c) NH 4 + ANSWER: N: -3 H: +1 (sum of oxidation numbers within co...
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Answered by Georgia B. • Chemistry tutor
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How to write a 'One effect question?'

GSCE examiners want to see a progression of thought and evidence of argument within these questions. Therefore the best way to tackle this would be to use connective words such as 'the fact that'.......'mean...
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Answered by Marius P. • History tutor
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Describe the formation of an Oxbow lake

An Oxbow lake is a middle-course feature of a river which is caused water eroding the corner of a meander, resulting in an isolated corner containing a body of water. This happens as the velocity of the wate...
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Answered by Marius P. • Geography tutor
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