I need to find the Sn for the arithmetic series with d = -4, an = 27, and n = 9

Khalfanebw 2022-09-23 Answered
I need to find the Sn for the arithmetic series with d = -4, an = 27, and n = 9
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anekesanxl
Answered 2022-09-24 Author has 12 answers
We may use the formula for the sum to n terms of an arithmetic series :
k = 1 n [ a + ( k - 1 ) d ] = n 2 [ 2 a + ( n - 1 ) d ]
= 9 2 [ ( 2 ) ( 27 ) + ( 9 - 1 ) ( - 4 ) ]
= 99
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