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Factorise x^2-25

=(x-5)(x+5)

Answered by Urja P. • Maths tutor

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There are 720 boys and 700 girls in a school. The probability that a boy chosen at random studies French is 2/3 The probability that a girl chosen at random studies French is 3/5. Work out the number of students in the school who study French.

How do you approach a simultaneous equations problem?

How to expand and simplify expressions

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