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Homework Help Forum: ALGEBRA
Posted by MELISSA on Sunday, April 19, 2009 at 10:47pm.
USE SUMMATION NOTATION TO WRITE A ARITHMETIC SERIES FOR THESE TERMS. PLEASE SHOW HOW TO DO IT.
15+25+35+...; N=7
4+8+12+...; N=4
3+7+11+...;N=8
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- ALGEBRA - Reiny, Sunday, April 19, 2009 at 11:13pm
I will do the first one.
look at 15, 25, 35, ..
there is an increase of 10 from one term to the next
so the formula will be (10n +/- something)
so if n= 1, most sigma notations start with n=1,
our first term is 10(1) + ?
what do I have to add to make the first term 15?
Isn't it 5?
so we have the expression (10n + 5)
test it: do I get 35 when n = 3 ?? YEAAH
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