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Q 108.

Intermediate Algebra
Found in: Page 1185
Intermediate Algebra

Intermediate Algebra

Book edition OER 2017
Author(s) OPENSTAX
Pages 1346 pages
ISBN 9780998625720

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Short Answer

In the following exercises, find the sum of the first 30 terms of each arithmetic sequence.

12, 18, 24, 30, 36, …

The obtained sum is 2970.

See the step by step solution

Step by Step Solution

Step 1. Given Information.

The arithmetic sequence is 12, 18, 24, 30, 36, .

Step 2. Find the common difference d.

Find the common difference of consecutive terms.


And, now find the 30th term of the sequence.


Step 3. Use the sum formula.

Use the sum formula Sn=n2a1+an to find the sum of the thirtieth term.


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