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Sever21 [200]
3 years ago
14

The sequence -14, -9, -4, 1, ..., 41 has 12 terms. evaluate the related series.

Mathematics
1 answer:
sesenic [268]3 years ago
6 0
The answer is 162.

sequence is arithmetic; d = 5

sum = (n/2)(a1+an)

an = a1 +d(n-1)

a12 = -14 + 5(11)

a12 = -14 + 55 ----> a12 = 41

sum: (12/2)(-14 + 41)
 = 6(27)
= 162
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