In algebra, letters are used when numbers are not known. Algebraic terms, such as \(2s\) or \(8y\), leave the multiplication signs out. So rather than \(2 \times s\), write \(2s\), and rather than \(8 ...
GCSE Edexcel Algebraic expressions - Edexcel Test questions Letters can be used to stand for unknown values or values that can change. Formulas can be written and equations solved to find solutions to ...
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