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To explain this question to a student, I would initially ask my own questions in order to gain an understanding of what the student already knows about simultaneous equations. I would ask if they had seen...

7.4²-2.9²=answer²

square root above answer to get the answer

You can use pythagoras' theorem to find the length of a side of a right angled triangle, provided that at least two of the lengths of the sides are known. The general rule is a² + b²...

je suis allé au marché avec mes amis. ils s'appellent guillaume et Thierry. ça fait deux ans que je les connais. Moi et eux sont allés au marché pour faire des courses. On a acheté une pomme et une baguet...

RE verbs Take off the RE ending and add a U to form the past participle. For example: Perdre (to lose) --> Perdu However there are some exceptions to the rule Prendre (to take) --> Pris