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What determines the elasticity of demand?

Price elasticity of demand is the responsiveness of demand to a change in price. (Definitions are key in economics!)1. The number and closeness of substitutes, if a good has many close (similar) substitutes,...
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Answered by Andrew B. • Economics tutor
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Solve these simultaneous equations. 5x + 2y = 20 and x + 4y = 13.

(1) 5x + 2y = 20(2) x + 4y = 13Step 1: Eliminate x or y. We do this but making either the x or y terms the same, in this example, I will make the y terms the same, by multiplying the first equation by 2.(1) ...
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Answered by Andrew B. • Maths tutor
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Solve 3(x+4) = 18

The first step would be to multiply out the bracket. So, using this example we would times each item inside the bracket by 3. As a result we would get: 3x + 12 = 18 Then we would need to move the 'x' value t...
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Answered by Alexandra B. • Maths tutor
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How do I rationalise the denominator of a fraction?

I am going to assume you know what an irrational number is, given that that should have been taught right at the beginning the topic of surds. When I talk about a “rational” number, here I mean “whole number...
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Answered by Andrew D. • Maths tutor
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How are leaves of a plant adapted to enable photosynthesis?

Leaves have 4 main adaptations which enable them to carry out photosynthesis successfully. 1) Thin - this allows carbon dioxide to easily diffuse into the leaf cells 2) Transparent epidermis - this allows li...
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Answered by Rebecca G. • Biology tutor
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