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Find the area of a circle with a diameter of 4cm.

The diameter of a circle is the longest measurement across the circle, and is a straight line passing through the middle. Half of this line is the radius, which is a straight line from the centre of the circ...
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Answered by Sabrina S. • Maths tutor
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Why does the price elasticity of demand (PED) of a product change at different levels of production?

Price Elasticity of Demand (PED) is the responsiveness of demand to a change in a product's price. PED may be calculated using the formula (% Change in quantity demanded / % Change in price). PED differs at ...
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Answered by Tom M. • Economics tutor
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When do I use the Sine rule?

You use the sine rule (a/sina=b/sinb) when you know 2 angles and one side amd you want to find out what the length of the side opposite one of the angles is.
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Answered by Edward S. • Maths tutor
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Explain why alkenes can have stereoisomers

"Stereo-" refers to 3D space, like with stereo sound involving sound from all directions. The C=C double bond has no free rotation, as this would require breaking the pi bond, which is energeticall...
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Answered by Kieran B. • Chemistry tutor
3584 Views

Describe the measures the body takes to achieve homeostasis in response to temperature changes

The body is able to utilise a number of measures in order to maintain an optimum body temperature of around 37 degrees celsius. Firstly, capillaries close to the skin surface are able to vasodilate (expand) ...
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Answered by Adam B. • Biology tutor
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