Practice Problems: Solve the following problems involving sequences and series. Provide step-by-step solutions.
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- Find the 12th term of the arithmetic sequence 4,8,12,16,…4, 8, 12, 16, \ldots4,8,12,16,….
- Calculate the sum of the first 15 terms of the geometric series 1,3,9,27,…1, 3, 9, 27, \ldots1,3,9,27,….
- Determine the common ratio of the geometric sequence 5,10,20,40,…5, 10, 20, 40, \ldots5,10,20,40,….
Complete the above, save them into one .pdf, and upload them when complete.