3 years ago

Find the 87th term of the arithmetic sequence 12, 0, -12

Mathematics

1 answer:

adelina 88 [10]3 years ago

4 0

Answer:

a(87) = -590

Step-by-step explanation:

Notice how each term of this arithmetic sequence is equal to the sum of the previous term and the common difference, -12.

The general formula a(n) = a(1) + (n - 1)d becomes:

a(n) = 12 - 7(n - 1)

and the 87th term a(87) = 12 - 7(87 - 1), or

a(87) = 12 - 7(86)

a(87) = -590

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