Question: 7. In an arithmetic sequence, the 15th term is 48 and the 40th term is 223. Determine a, d and the general formula. 8. How

7. In an arithmetic sequence, the 15th term is 48 and the 40th term is 223. Determine a, d and the general formula.

8. How many terms are in the sequence 2, 14, 26, ..., 674? Explain your thought process.

9. In a geometric sequence, the 8th term is -384 and the 15th term is 49152. Determine a, r and the general formula.

10. A theatre has 25 seats in the first row. Each row has 8 more seats than the row in front of it. How many seats are in the 22nd row?

11. Determine the interest rate that would cause an investment of $ 10000 to double in 15 years if the interest is compounded monthly. Round the interest rate to the nearest whole number.

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