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Describe a positive externality

A positive externality is a good or service which benefits a 3rd party when it is consumed or produced. One example of a positive externality in production is passersby enjoying the smell of a coffee shop. T...
CH
Answered by Chris H. • Economics tutor
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What is the difference between a heterogeneous catalyst and a homogeneous catalyst?

Homo geneous catalyst - catalyst is in the same phase as the reactants. Hetero geneous catalyst - catalyst is in a different phase as the reactants. What this means is that the reactants will be either a gas...
KW
Answered by Katie W. • Chemistry tutor
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3 teas and 2 coffees have a total cost of £7.80 5 teas and 4 coffees have a total cost of £14.20 Work out the cost of one tea and the cost of one coffee.

You make simultaneous equations. 1.) 3T+2C=7.82.) 5T+4C=14.2Then you make either the C or the T coefficient equal in both equations. I choose to make the C coefficients the same. So I multiplied equation 1 b...
DS
Answered by Dan S. • Maths tutor
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What is the difference between the use of l'imparfait and le passé composé

Le passé composé is one of the past tenses. It is formed by using an auxiliary/first verb (either être or avoir) in the present tense and following it with the past participle of the desired verb. L’imparfai...
RW
Answered by Rosalind W. • French tutor
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Differentiate (x^2)cos(3x) with respect to x

First we start off by seeing that we are multiplying together two functions both containing x, so we want to apply the product rule. As we know the product rule is (f(x)g(x))'=f(x)g'(x)+f'(x)g(x) so we can a...
AB
Answered by Arthur B. • Maths tutor
9850 Views