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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!
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
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



User Rod Talingting
by
7.9k points
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