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Sequences and Series

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Question 142

A mining company is evaluating the output of a lithium reserve.

  • In Year 1, the company extracts 4,500 tonnes of lithium.
  • In Year 16, due to depletion, the annual yield is predicted to drop to 1,500 tonnes.

Model A assumes that the annual yield will decrease by the same fixed amount each year.

a.

According to model A, determine the amount of lithium extracted in Year 2.

[2]
b.

Model B assumes that the annual yield will decrease by the same percentage each year.

According to model B, determine the amount of lithium extracted in Year 2. Give your answer to the nearest tonne.

[2]
c.

Calculate the difference between the total yield predicted from Year 1 to Year 16 inclusive under the two models. Give your answer to the nearest tonne.

[4]
Markscheme

Sequences and Series Questions

  1. A Level
  2. /Maths
  3. /Sequences and Series

326 exam-style questions on Edexcel A Level Maths Sequences and Series, covering 3.1 Arithmetic Sequences, 3.2 Arithmetic Series, 3.3 Geometric Sequences, 3.4 Geometric Series, 3.5 Sum to Infinity, 3.6 Sigma Notation, 3.7 Recurrence Relations, and 3.8 Modelling with Series. Each one has a worked solution and a mark scheme showing where the marks go.

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