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The sum of the first 10 terms of an arithmetic sequence is 530. what is the first term if the last term is 80? what is the common difference?

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Lhuckyid
S=(n/2)(a+an)
530=(10/2)(a+80)
a=26..... the first term

difference is an=a+(n-1)d
80=26+(10-1)d
d=6 is the difference...