Answers

2016-06-30T18:09:27+08:00
460=8,365+(35-1)d 460=8,365+34d 460-8,365=34d -7905÷34=34d÷34 D= -2325
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2016-06-30T19:04:19+08:00
Sn is the sum of the arithmetic sequence.
A1= ?
D=?
An= 460
Sn= n/2 (a1+an)
8,365=35/2 (a1+ 460)
8,365= 17.5 (a1+460)
8,365= 17.5a1 + 8,050
8,365-8,050= 17.5a1
315=17.5a1
We divided it by 17.5 so the answer is
18=a1

18 is the first term.
We are going to find the common difference next.

An=a1+(n-1)d
460= 18+(35-1)d
460= 18+34d
460-18=34d
442=34d
We divided it by 34. So the answer is
13=D

First term is 18
Common difference is 13
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