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How and why does price elasticity change along a demand curve?

Price elasticity of demand is defined as the proportional change in demand to a change in price. If the response in demand is more than proportional to the price change, demand is elastic. A less than propor...
AW
Answered by Andrea W. • Economics tutor
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Describe briefly the nature of metallic bonding and use this to explain why metals are malleable (can be hammered into shape) and conduct electricity

Metallic bonding occurs as a result of the electrical attraction forces between the protons in the nuclei of the metal species and the delocalised electrons (which form a sea of electrons surrounding the arr...
MA
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Integral of 1/(x^3 + 2x^2 -x - 2)

Factorise denominator using the factor theorem giving - 1/(x+1)(x+2)(x-1) Use partial fractions to turn this into an easier form to integrate giving - 1/3(x+2) + 1/6(x-1) - 1/2(x+1) using integral 1/x = ln(x...
MO
Answered by Mojowo O. • Maths tutor
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A curve has the equation 2x^2 + xy - y^2 +18 = 0. (1) Find the coordinates of the points where the tangent to the curve is parallel to the x-axis.

Firstly notice that the coordinates of the points where the tangent to the curve is parallel to the x-axis are precisely the points where the rate of change of y with respect to x is not changing. That is, w...
OL
Answered by Oliver L. • Maths tutor
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Briefly explain the common types of erosion that shape a river from source to mouth

The first is Hydraulic Action. This is the force of the river against the banks causing air to be trapped in cracks and crevices. The pressure then weakens the banks and gradually wears it away. Secondly, Ab...
JB
Answered by Joe B. • Geography tutor
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