4MA1/1H Jan 2021, Question 15: Calculating with Bounds
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1H (Higher) · Calculator · 3 marks
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The question, in short
Using a = (v − u)/t with v = 9.6, u = 3.8 and t = 1.84, each rounded, find the upper bound of a to 2 decimal places, showing working.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 3 marks
- 1v = 9.6 (1 d.p.) so upper bound of v is 9.65
- 2u = 3.8 (1 d.p.) so lower bound of u is 3.75
- 3t = 1.84 (2 d.p.) so lower bound of t is 1.835
- 4a = (v − u) / t
- 5a = (9.65 − 3.75) / 1.835
- 6a = 5.9 / 1.835
- 7a = 3.2152...
- 8a = 3.22 (correct to 2 decimal places)
Answer3.22
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