1.2 Arithmetic sequences and series

1.2 Arithmetic sequences and series Quiz

IB Maths: Analysis and Approaches HL: Quiz

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5 questions, one answer each

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1. An arithmetic sequence has $u_1 = 7$ and $d = -3$ . Find $u_{20}$ .
- A. -50
- B. -53
- C. 67
- D. -60
2. Find $\sum_{r=1}^{10}(2r + 1)$ .
- A. 120
- B. 110
- C. 21
- D. 130
3. $u_2 = 11$ and $u_6 = 27$ . Find $u_1$ .
- A. 7
- B. 4
- C. 11
- D. 3
4. 1000 USD earns simple interest at 5% per year. What is its value after 8 years?
- A. 1400 USD
- B. 1477.46 USD
- C. 1050 USD
- D. 1350 USD
5. Weekly sales are 40, 46, 51, 58, 64. Which common difference best models this?
- A. 6
- B. 5
- C. 51.8
- D. 64