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What is the range of the function y = x^2?

Every mathematical function has a range and a domain. The range of a function is the set of possible outputs the function has. In this case, we know that our output (y) must be a positive number because if w...
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Answered by Molly B. • Maths tutor
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By definition, a miracle is impossible.” Discuss.

In order to judge whether a miracle is possible, one must first decide on a definition of the concept of a miracle, which has been widely debated amongst a range of philosophers over many years. St Augustine...
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The theme of loss is central to both Heaney’s “Death of a Naturalist” and Hosseini’s “The Kite Runner”. Do you agree?

Although at first glance, ‘The Kite Runner’, published in 2003, and Heaney’s collection of poems published in 1966 entitled ‘Death of a Naturalist’ seem to be from two entirely different realms of literature...
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How would I approach a 'to what extent...' question in my exam?

This type of question may seem very complicated but when broken down into steps becomes much more simple. A question asking 'to what extent...' you believe that something had an impact on something else is r...
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Answered by Elizabeth R. • History tutor
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As the volume of blood in the ventricles of the heart increases, with all other factors constant, stroke volume increases till a point. Explain why. (5)

Define stroke volume as the volume of blood expelled by the left ventricle into the aorta per contraction of the heart.Idea that as blood volume in the ventricle increases, this stretches the sarcomeres of c...
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Answered by Azmaeen Z. • Biology tutor
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