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This is a multiple choice question, with possible answers:

(a) -3 < x <  3;

(b)  0 < x <  4;

(c)  1 < x <  3;

(d) -1 < x <...

If we want to express a completed action which happened in the past in French, we use the perfect tense. In order to form it we use either avoir or etre and conjugate them in the present form and then ...

An enzyme is a protein catalyst. 

A catalyst is a substance which alters the rate of a chemical reaction. (So it can speed up a chemical reaction). 

The key...

As university places become more hotly contested and admission interviews look to distinguish between the regurgitators and the critical thinkers, never has it been more important to display mental sup...

If you have the question:

What is 2/3 minus 1/5?

You should start this question by looking at the demoniators (the bottom of the fraction). You want to get a number that is ...