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Introduction- say what the trade balance is, '  the difference between the value of a country's imports and exports for a given period'.
first way to solve it- devalue the currency like we did in 19...

The sympathetic nervous system is most active in times of stress and acts to increase activity, such as by increasing heart rate, ventilatory rate and dilates pupils. It uses the neurotransmitter noradren...

The first thing to notice here is that the denominator of the integrand is a case of 'difference of two squares'. The integral, which I will call I, can be rewritten as the integral of 4/((1+x)(1-x)) dx. ...

Covalent character occurs in ionic bonds when the postive (usually metal) ion is highly charge dense and can polarise the counter ion causing electrons to be shared between the two ions rather than electr...

Passage questions appear really tricky from the outset, because you don't know what section of your text you might have to read and what may come up. Luckily, however, these questions actually give you a ...