aleexiswood aleexiswood

26-11-2019
Mathematics

contestada

calculate S30 for the arithmetic sequence defined by {an}={3.1n-2}
a.) 91
b.) 113
c.) 1,381.5
d.) 1,397.5

Respuesta :

PollyP52 PollyP52

26-11-2019

Answer:

c) 1,381.5.

Step-by-step explanation:

First term = 3.1 *1 - 2 = 1.1

2nd term = 3.1*2 - 2 = 4.2

3rd term = 3.1*3 - 2 = 7.3

so the common difference d = 3.1.

S30 = (30/2) [ 2* 1.1 + (30-1) * 3.1)]

= 1,381.5.

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