djdjddidi djdjddidi

27-08-2021
Mathematics

contestada

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

Respuesta :

jcherry99 jcherry99

28-08-2021

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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