Top answers

What is Reverse Polish Notation?

Reverse Polish Notation (or RPN) is simply a different mathematical way of laying out equations, take for example the expression: 7+ 9 The layout is <First number> <Operator> <Second Number&gt...
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Answered by Nick P. • Computing tutor
5936 Views

How are blood glucose levels regulated in humans?

Blood glucose homeostasis involves maintaining the levels of blood glucose within a very narrow limit around a set point (90mg 100cm-3). This is done via hormonal regulation. On one hand, insulin which is a ...
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Answered by Christie M. • Biology tutor
5698 Views

How do I analyse a source for its origin, purpose, values and limitations on History Paper 1?

On History Paper 1, you'll be asked to analyse a number of sources for their "origin, purpose, values and limitations". When done correctly, these questions can be easy points as long as you accura...
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Answered by Bethany G. • History tutor
47284 Views

How can I write an introduction that captures the attention of an examiner immediately?

Creating a really gripping introduction for your essay is actually easier than you may think! Really, you only need three sentences arranged in a particular way and you'll be able to draw your reader in inst...
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Answered by Eilish L. • English tutor
6913 Views

What is a potential divider?

A potential divider is essentially a series circuit. The characteristics of a series circuit is such that voltage from the source (a battery for example) gets split across the resistors according to the valu...
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Answered by Mehrin K. • Physics tutor
6590 Views