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SpyIntel [72]
3 years ago
7

What is the sum of the arithmetic sequence 149, 135, 121, …, if there are 28 terms?

Mathematics
1 answer:
andrey2020 [161]3 years ago
3 0
I needed my brother to help me with this one,so here is the answer.
The common difference is -14. 

<span>Let's simplify this by expressing each term as </span>
<span>163 - 14n </span>
<span>where n is the number of the term. </span>

<span>Then the sum of the 28 terms is </span>
<span>28 * 163 - 14 (1+2+3+...+28) </span>
<span>= 4,564 - 14 * 28 * 29 / 2 </span>
<span>= -1,120 </span>


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