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Question in attachment
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Question in attachment

Question in attachment-example-1
User Emanuel P
by
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1 Answer

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Answer:


a_(1)=6

Explanation:

It is sum of arithmetic progression


$S_(20)=(20)/(2) [2a_(1)+(20-1)\cdot 4]$


$880=10[2a_(1)+(19)\cdot 4]$


$880=10[2a_(1)+76]$


880=20a_(1)+760


120=20a_(1)


a_(1)=6

User AndreyF
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