4MA1/2H Jun 2024, Question 17: Proportion to Powers of x
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2H (Higher) · Calculator · 3 marks
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The question, in short
Q varies directly with the square root of d, and Q = 4.5 when d = 324. Find a formula expressing Q in terms of d.
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Solution · 3 marks
- 1Q = k√d
- 24.5 = k√324
- 3√324 = 18
- 44.5 = k × 18
- 5k = 4.5 / 18 = 0.25
- 6Q = 0.25√d
AnswerQ = 0.25√d
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