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Try this quiz based on GCSE Maths past ... expressions - Edexcel Letters can be used to stand for unknown values or values that can change. Formulas can be written and equations solved to find ...

Maths questions often start with the command ... of 1 kg of water from 18°C to 95°C. [3 marks] Use the formula sheet to find an equation which links energy, mass, specific heat capacity and ...