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What is meant by the term 'opportunity cost'

This simply means, 'the next best alternative foregone'. We can explain this by saying if I only had £5 to buy lunch, I could either buy a sandwich or half a pizza. The opportunity cost of me buying a sandwi...
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Answered by KATIE C. • Economics tutor
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What is the difference between a codified and uncodified constitution?

The difference between a codified and uncodified constitution is quite simple. Codified means the constitution is written down in a single document. The US constitution is codified. An uncodified constitutio...
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Answered by KATIE C. • Politics tutor
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How are some plants able to fix gaseous nitrogen from the atmosphere?

Leguminous plants have nodules on their roots that contain, symbiotic bacteria. These bacteria are capable of turning gaseous nitrogen ultimately to nitrate, which the plant can then use in order to synthesi...
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Answered by Sam C. • Biology tutor
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Find the set of values for which x^2 - 7x - 18 >0

To see where the graph is greater than zero, we start by finding where it meets zero. By factorising (x^2 - 7x - 18), we find it equals (x-9)(x+2). The expression equals zero at the points x = 9 and x = -2. ...
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Answered by Charlotte W. • Maths tutor
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what role did women play in medieval knighthood?

In order to accurately explore the role of women in medieval society, and in relation to knighthood, it is most effective to look at a combination of primary and secondary sources. Starting with the rise of ...
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Answered by Rebecca M. • History tutor
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