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The perfect tense in Spanish translates as 'to have done something' in English. It is used to express actions that begun in the past and are carried through to the present. For example, 'Todavía no ha tra...

So, the empirical formula means the smallest value, like the lowest common denominator in maths, but instead of fractions we are going to be using chemical formulae. I always find it easiest to set it out...

The first thing to do when choosing a quote to analyse in an essay in to make sure it is relevant to your argument. Think about the theme in the question you have been set - for example, ...

using our second equation, we can see that x=y+2. Therefore we can sub x into the first equation. This will give us 2*(y+2)+5y=25. We can go ahead and expand the brackets, which gives us 2y+4+5y=25. We ca...

Nixon's policy regarding Vietnam was characterised by his rhetoric 'Peace with honor'. He was determined to not be the first American to lose a war, but also realised that US withdrawal was necessary. Nix...