SOLUTION: S30=5235 and A1=15 Find A30 and d

SOLUTION: S30=5235 and A1=15 Find A30 and d

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Question 1071095: S30=5235 and A1=15
Find A30 and d
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!

is my favorite way of calculating the sum.
Substituting,

The formula for
based on and is

so, substituting we get

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