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3 years ago

Calculate S30 for the arithmetic sequence defined by {an}={3.1n-2}

Mathematics

1 answer:

timurjin [86]3 years ago

3 0

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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