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The term containing x4y5 will be C(9, 5)x4(-2y)5 = (9!/(5!4!))x4(-2)5y5The coefficient of which will be 1...
There are (48/8)*3=18 boys. Since the ratio of boys to girls is 8:3 you divide the number of girls by 8 which gives 6 and then multiply by 3 to give the number of boys.
The first thing to keep in mind for source questions is to cover all the sources in your answer equally. In an A Level question, you will usually be given 4 and it's perfectly fine to structure your answe...
Firstly; the perfect tense is a compound formation, meaning there are two parts to its formation. This includes the auxiliary verb, namely 'avoir' or 'être' plus the past participle which is the conjugate...
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