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I understand! Thank you so much!
I solved 2 equations simultaneously: This is the formula for an artihmetic sum.
this means we have 2 n's for equation1. With 2 n's we can get a1 ( the first term ) and d ( the distance between each term ). We have the 2 n's they are n =10 and n = 20.
Substituting into 1:
Clean em up:
a1 = 3
d = 4
Can you finish up now?
I missed this class on how you do this. What process did you go through to get these numbers?
Find the first five terms of an arithmetic series with S10 = 210 and S20 = 820