Mathematics, 31.07.2019 05:00 juniorvalencia4
Find a1 for the arithmetic series with s20 = 80 and d = 2
Answers: 2
![S _{n} = \frac{n}{2} [2a_{1} +(n-1)d]](/tpl/images/0153/1625/f1f13.png)
is the sum of the arithmetic sequence 
is the number of terms 
is the difference 
is the first term
, 
, and 
. Lets replace those values in our formula to find ![80= \frac{20}{2} [2a_{1} +(20-1)2]](/tpl/images/0153/1625/41074.png)
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Find a1 for the arithmetic series with s20 = 80 and d = 2...
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