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Life
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Write each arithmetic series as the sum of terms, find each sum.
 one year ago
 one year ago
Life Group Title
Write each arithmetic series as the sum of terms, find each sum.
 one year ago
 one year ago

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Life Group TitleBest ResponseYou've already chosen the best response.0
dw:1354171632278:dw
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
is the answer 20?
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
it similar by : 3(1) + 3(2) + 3(3) + 3(4) + ... + 3(10) = 3(1+2+3+4+...+10) = ......
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
so im wrong, i thought you were supposed to use the formula, Sn=n(a1+an)/2
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
That wording is a bit interesting. Are there multiple questions like this to find the answer for, or just this one?
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
yea there are about 8 questions that are under that two part question
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Your formula would work; you must have done it wrong.
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
\[S_{n} = \frac{n}{2} (a_{1} + a_{n})\] Did you use 10 for \(n\) and 3 for \(a_{1}\)?
 one year ago

RadEn Group TitleBest ResponseYou've already chosen the best response.1
for : n=1 > 3(1) = 3 n=2 > 3(2) = 6 n=3 > 3(3) = 9 .... so on, the series be 3+6+9+....+30 yes, use the formula like @geoffb said :)
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
for n, i put 10, a1, i put 1, and for A n, i put 3
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Okay, that's the problem. \(a_{1}\) means the value of your first term (which is 3 times 1, or 3). \(a_{n}\) means the value of your nth term. In this case, n is 10, so the value of the 10th term is 3 times 10, or 30.
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
i got 75, am i right?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
No. What is your calculation?
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
dw:1354172733466:dw
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
Why are you using 10 for \(a_{n}\)?
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
It wants \(a_{n}\), not \(n\).
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
dw:1354173323720:dw
 one year ago

geoffb Group TitleBest ResponseYou've already chosen the best response.1
That looks great.
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
ughhh finally!
 one year ago

Life Group TitleBest ResponseYou've already chosen the best response.0
so i get 330/2=165
 one year ago
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