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By GCSE, you will probably be familiar with the P.E.E (Point, Evidence, Explain) structure but even then, analysing your ‘evidence’ without simply feature spotting can be quite difficult. As you learn ...

Substitute x in terms of y into the first equation:

(2y+6)²+y²=36

Use FOIL to expand the brackets

4y²+24y+36+y²=36 ...

People are immunised against pathogens through vaccination - usually an injection. 

A vaccine is comprised of dead, inactive or weakened...

In the modern era, there are more ways than ever to practise a language without knowing someone who speaks it. Obviously, if you do know someone, that'd be ideal, but until you meet a Spanish speaking ...

When a question asks you to make something the subject of an equation, it is asking you to rearrange it to get it in the form of, for example when 'p' is the subject, 'p = ....'

First we ...