Question: im doing my math homework and need help figuring out these questions that I've been stuck on. can you help me? 1) how can I

im doing my math homework and need help figuring out these questions that I've been stuck on. can you help me?

1) how can I find the sum of the first 25 terms of the sequence.

1, 9, 17, 25, ...

2) how can I find the sum of the first 50 terms of the arithmetic sequence.

11, 5, 1, 7, ...

3) how can I find the sum of the first 20 positive even integers.

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