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When do we use the 'passé composé' and 'imparfait' in French?

Both tenses refer to actions in the past. With the passé composé, we use this to describe an action which was completed in the past at a specific moment. For example: Je suis tombé (I fell). We use the impar...
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Answered by Katy H. • French tutor
2644 Views

Given the parametric equations x = t^2 and y = 2t -1 find dy/dx

The first step is to find dx/dt and dy/dt, this is done using standard differentiation rules giving the resultsdx/dt = 2t dy/dt = 2 The second step is to eliminate dt. This can be done by the multiplication ...
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Answered by Matthew H. • Maths tutor
10207 Views

How should I approach a comparative essay between Things Fall Apart and Heart of Darkness?

There are a variety of ways of approaching the structure of a comparative essay. I find the most effective method in achieving a high-grade essay is to run a comparison throughout the essay, rather than focu...
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Answered by Kate M. • English tutor
3726 Views

Find the inverse of a 2x2 matrix

Consider the 2x2 matrix M , consisting of elements a , b , c and d . To find its inverse one must first find the determinant of M . This is achieved by calculating the result of the expression ad - bc . The ...
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Answered by Giovanni D. • Maths tutor
5872 Views

Explain why a demerit good is overconsumed, if left to market forces.

A demerit good is a good which has a negative impact on its consumer and others in society. An example of this is alcohol, which can cause health problems for people who drink it, but also leads to external ...
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Answered by Henry H. • Economics tutor
16537 Views