Mathematics, 06.05.2021 15:30 merunikitty1226

The 15th term of an arithmetic sequence is 21 and the common difference is -4. (a) Find the first term of the sequence.
(b) Find the 29th term of the sequence.
(c) Find the sum of the first 40 terms of the sequence.

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The 15th term of an arithmetic sequence is 21 and the common difference is -4. (a) Find the first term of the sequence. (b) Find the 29th term of the sequence. (c) Find the sum of the first 40 terms of the sequence.

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The 15th term of an arithmetic sequence is 21 and the common difference is -4. (a) Find the first term of the sequence.
(b) Find the 29th term of the sequence.
(c) Find the sum of the first 40 terms of the sequence.