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Since we have to differentiate a fraction, we must use the quotient rule. 

The quotient rule: If y = u/v, dy/dx = (vdu/dx - udv/dx)/v²

So we must work out each of the ter...

In English, the subjunctive is used to express wishes or hypothetical situations, e.g. I wish you were nicer to me ('were' is in the subjunctive). In French, it's fairly similar. The subjunctive is associ...

2x + y = 7

3x - y = 8

You cannot find x and y using only one equations, but using both you can! So first you have use algebra to make both equations = y. Try this for the first equation by r...

x = 0.848,2.29

Positive statements are objective and can be tested whether they are true or false.

Normative statements are subjective value judgements that cannot be tested whether they are true or false.