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stiks02 [169]
3 years ago
13

the fourth term of an arithmetic sequence is 141, and the seventh term is 132. what is the first term?

Mathematics
1 answer:
Cerrena [4.2K]3 years ago
7 0
The 1st, 4th, and 7th terms make an arithmetic sequence of their own. The 4th term is the average of the 1st and 7th, so ...
   (1st +7th)/2 = 4th
   1st + 7th = 2×4th
   1st = 2×4th - 7th

The first term is ...
   2*141 - 132 = 150
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