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Misha Larkins [42]
3 years ago
12

. Find the sum of the first 20 terms of the arithmetic sequence 27, 22, 17, ....

Mathematics
1 answer:
valkas [14]3 years ago
8 0

Answer:

Step-by-step explanation:

a = 27

n = 20

d = -5

L20 = 27 + (n - 1)*d

L20 = 27 + (20-1)*_5

L20 = 27 + 19*-5

L20 = -68

Sum = (a + L)*n/2

Sum = (27 - 68)*20/2

Sum = -41 * 10

Sum = - 410

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Answer:

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In such problems, it isn't clear if the desired answer is the ratio of two integers or if it is 1 : (something). We have expressed it both ways, so you can use the answer that matches your requirement.

7 0
3 years ago
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5 0
3 years ago
Read 2 more answers
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7 0
3 years ago
2 less than 7 times a number c is written as
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7 0
3 years ago
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