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Question from an Edexcel GCSE Maths Higher Paper (Nov 2018) - Solve the simultaneous equations: 5x + y = 21, x-3y = 9 (3 marks)

So since there are two unknowns in this question, its slightly more difficult than a normal equation where we only have 1 x or y that we're trying to work out. There are two ways to deal with this type of...

Answered by • Maths tutor

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Mill’s Harm Principle rules out the exercise of political power for the purpose of protecting people from harming themselves. Is Mill right in thinking that such exercises of power are wrong? In your answer, discuss Mill’s argument for this claim.

J. S. Mill’s commonly called ‘Harm Principle’ has demonstrated to be permanently and influentially fueling debates on the topic of the limits of legitimate political power and its intervention in the peop...

Answered by Emma E. • Philosophy tutor

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Harry mixes white paint and blue paint in the ratio 2:5. He makes a total of 21 litres of paint. How much more blue paint does he need to add to the mixture so that the ratio of white paint to blue paint becomes 1:4?

W:B = 2:5 Total of 21 litres of paint. We want a ratio of W:B = 1:4 = 2:8
Therefore we must add 3 parts of blue paint
2 + 5 = 7 parts total7 parts = 21L1 part = 3L3 parts = 9L
Ther...

Answered by James B. • Maths tutor

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20cm3 of 0.5moldm-3 of HCL is diluted by adding 15cm3 of water. This diluted solution is titrated against a 0.3moldm-3 solution of NaOH. What is the volume of the NaOH in cm3 required to reach the endpoint of the titration?

We need to calculate how many moles of HCl are being titrated. This is the volume in dm3 times the concentration (trick: you can do dimensional analysis if unsure of the formula): number of moles of HCl =...

Answered by • Chemistry tutor

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