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Chère Julie, Comment vas-tu? J'espère que tes vacances se passent bien. Je t'écris cette lettre pour te donner de mes nouvelles. En ce moment, je suis en vacances à Marseille. La météo est très bonne: il ...

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 to...

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....

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...

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)...