SOLUTION: Write in terms of a: S=n(a+L)/2

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Question 1061006: Write in terms of a: S=n(a+L)/2
Answer by Boreal(15235) About Me  (Show Source):
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S=n(a+L)/2
Isolate the a.
2s+n(a+L)
divide by n both sides
(2s/n)=a+L
subtract L from both sides
(2s/n)-L=a