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Expand and simplify fully 4(x - 2) - 2(3 - 5x)

Firstly, expand out the first bracket - 4x - 8 - 2(3 - 5x) Then the second bracket (remember a minus x a minus = a positive) - 4x - 8 - 6 + 10x Then finally group the like terms together - 4x + 10x - 8 - 6 =...
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Answered by Calum R. • Maths tutor
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Explain the diffusion process of gas exchange in the lung during respiration

Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs. Blood travelling to the lungs is deoxygenated and instead of oxygen, carbon dioxide is bound to the red blood cells. Th...
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Answered by Calum R. • Biology tutor
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Find the period of a wave given that it has a speed of 200m/s and a wavelength of 2m

The equation for finding the period of the wave is the reciprocal of the frequency hence th eperiod T =1/f substitute this into the wave speed equation v=f x lambda solve for f f = v/ lambda f= 200/ 2 f= 100...
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Answered by Zubaydah J. • Physics tutor
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Why are transformers used in the National Grid?

The National Grid is how electricity is distributed from suppliers to consumers (commercial or private household). Power stations produce power in the region of Mega Watts (the order of millions of watts) an...
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Answered by Mike R. • Physics tutor
19082 Views

What's the difference between 'on' and 'nous'? I've heard that both mean 'we' but I don't know which one to use.

It is true that ' on ' and ' nous ' both mean ' we ' and can be used pretty much interchangeably but there are subtleties to be aware of when using them. Although you can use both, they are used in different...
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Answered by George D. • French tutor
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