3 years ago

Find the sum of the first 21 terms of the arithmetic sequence 5, -2, -9.

Mathematics

2 answers:

Vadim26 [7]3 years ago

6 0

Answer:

-1365

Step-by-step explanation:

The difference is -7, so you apply that to each number to get your answer.

USPshnik [31]3 years ago

5 0

The correct answer is idk for me

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