Mathematics: Can anyone explain to me what this is asking/how to do this? i think it s for the summation formula [tex]s_{n} =n(rac{a_{1}+a_{n} }{2})[/tex] but if i m given a1, an, and n, what are the other numbers for?

Can anyone explain to me what this is asking/how

Ответ:

vjackie101ov3kju

12.01.2022

Mathematics

D 3500

Step-by-step explanation:

This question is asking for the sum of all the terms in an arithmetic series.

So using the formula : Sn = n/2 (a+l) , where Sn is the sum of n terms, a is first term, and l is last term, we try to find Sn, with n being 25, a being 20, and an which is a25 or the twenty fifth term being 260, also being the last term.

Hence we can produce the formula for Sn which is Sn=25/2 (20+260)

Sn=25/2 (280)

=3500

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Ответ:

arnold2619

18.10.2022

Mathematics

#1 is simply 7

#2 is simply 1

#3 is simply 1/6 and 1/6 as a decimal is 0.167

Step-by-step explanation:

Brainliest when you can if you will please

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Can anyone explain to me what this is asking/how to do this? i think it's for the summation formula $s_{n} =n(\frac{a_{1}+a_{n} }{2})$ but if i'm given a1, an, and n, what are the other numbers for?

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Can anyone explain to me what this is asking/how to do this? i think it's for the summation formula but if i'm given a1, an, and n, what are the other numbers for?

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Can anyone explain to me what this is asking/how to do this? i think it's for the summation formula $s_{n} =n(\frac{a_{1}+a_{n} }{2})$ but if i'm given a1, an, and n, what are the other numbers for?