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What is the difference between the preterite and imperfect tenses in Spanish? When would you use each?

The preterite and imperfect tenses have different conjugations, which it is necessary to learn by heart. In terms of usage, whilst they both refer to actions that have taken place in the past, they do have v...
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Answered by Amy T. • Spanish tutor
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Celine has £5 to buy pens and rubbers. Pens are 18p each. Rubbers are 30p each. She says “I will buy 15 pens. Then I will buy as many rubbers as possible. With my change I will buy more pens.” How many pens and how many rubbers does she buy? [5 marks]

Answer: 16 pens and 7 rubbers
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Answered by Ardra R. • Maths tutor
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x^2 = 4(x – 3)^2

This is a quadratic equation, which contains terms up to x 2 . All quadratic equations can be written in the form a x 2 + b x + c = 0 where a , b and c are numbers, and a cannot be equal to zero. Expand the ...
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Answered by Jennifer W. • Maths tutor
4504 Views

What is Price Elasticity of Demand?

In this case, I would draw out two diagrams of a good with elastic demand and another good with inelastic demand.Price elasticity of demand is a measure to show the responsiveness of the quantity demand if t...
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Answered by Nicole K. • Economics tutor
2516 Views

Explain one negative externality that could occur due to the building of a new airport.

A negative externality is a cost that is suffered by a third party as a consequence of an economic transaction. In a transaction, the producer and consumer are the first and second parties, and third parties...
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Answered by Uvini E. • Economics tutor
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