jonasnelson jonasnelson

26-02-2021
Mathematics

contestada

Select the correct answer. What is the sum of the first 17 terms of this arithmetic series? Use Sn=n(a1+an/2) .

-28 + (-13) + 2 + 17 + ⋯

A. 1,692 B. 1,564 C. 227 D. 212

Respuesta :

cwrw238 cwrw238

26-02-2021

Answer:

1564.

Step-by-step explanation:

First term = -28 and common difference = 15.

Sum = (17/2)(2*-28 + (17-1)15)

= 8.5 * 184

= 1564.

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