SOLUTION: S=n/2(a+b) express b in terms of a,S,and n

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Question 1170355: S=n/2(a+b)
express b in terms of a,S,and n
Answer by Boreal(15235) About Me  (Show Source):
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I assume this is S=(n/2)(a+b)
2S/n=a+b
b=(2S/n)-a
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let a=3 b=4 and n=20
S=70
4=(140/20)-a which is 7-3