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Please help! this is for algebra 2. im not sure that im doing it correctly. thank you!

Please help! this is for algebra 2. im not sure that im doing it correctly. thank you!
asked 36.5k views
4 votes
Please help! this is for algebra 2. im not sure that im doing it correctly. thank you!

Please help! this is for algebra 2. im not sure that im doing it correctly. thank-example-1
asked
User Ophir Radnitz
by
7.7k points

1 Answer

5 votes
a) an = a1 + (n-1)d

so Sn = (n/2)[ a1 + ( a1 + (n-1)d)]
= (n/2) [ 2a1 + (n-1)d ]
= na1 + n(n-1)
-------- d
2



answered
User Rod Talingting
by
7.9k points
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