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What is river rejuvenation?

Rejuvenation is the process by which a river adjusts to a new base level. Base level changes occur when the volume of water at the mouth of the river decreases, commonly by euastatic or isostatic sea level c...
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Answered by Ellie M. • Geography tutor
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In February 2013, the proposed takeover by Barr of Britvic was referred to the Competition Commission for investigation. There were likely to have been concerns that the takeover would lead to...

(Barr and Britvic are two of the three largest soft drink firms in the UK.) A economies of scale B an increase in consumer surplus C a decrease in contestability D a reduction in external economies of scale ...
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Answered by Brodie W. • Economics tutor
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How do you work out breakeven?

Breakeven is the output a company needs to meet to make their revenue equal costs. It's worked out using the formula Fixed costs divided by selling price minus variable costs.
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A circle C with centre at the point (2, –1) passes through the point A at (4, –5).....

(a) Find an equation for the circle C. Before tackling a question like this it is always a good idea to draw a rough sketch of all the information that's given to you. The general equation of a circle is x 2...
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Answered by Brodie W. • Maths tutor
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Describe how negative feedback is used to control blood glucose concentration (6 marks)

Throughout your answer to this question make sure that you are cramming as much key language into it as possible! Phrases like 'islets of Langerhans', 'beta/alpha cells', and 'transporter proteins' will all ...
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Answered by Matt H. • Biology tutor
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