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Please Help! Show me how its done please!
Find the sum of the first 8 terms of the sequence.
1, 3, 7, 11, ...
 one year ago
 one year ago
Please Help! Show me how its done please! Find the sum of the first 8 terms of the sequence. 1, 3, 7, 11, ...
 one year ago
 one year ago

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amistre64Best ResponseYou've already chosen the best response.1
sooo, you need help adding? or is it that you really need help in determining all the 8 terms?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
since the numbers are getting smaller, or going negative, ... and they seem fairly close together. We can try to see if they are subtracting a like amount each time.
 one year ago

NotamathgeniusBest ResponseYou've already chosen the best response.0
Fine out what the term is going up by. I see 4
 one year ago

Val97Best ResponseYou've already chosen the best response.0
I need help determining all the 8 terms, this is pre cal and it really confuses me. I'm not sure what formula to use. The Arithmetic Sequence formula?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
formulas are only half the battle. seeing a pattern is the key once you see that pattern, the formula is known by default
 one year ago

Val97Best ResponseYou've already chosen the best response.0
So that is it? Its isn't any of the formulas they gave me?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
if you subtract 4 from the last term given, what do you get?
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
.... or if you want to create an expression to use in summation thats fine too \[\sum_{n=a}^b~a_1+d(n1)\] \[\sum_{n=a}^b~a_1+\sum_{n=a}^bd(n1)\] \[a_1(ba)+d\sum_{n=a}^bn1\] \[a_1(ba)+d\sum_{n=a}^bnd\sum_{n=a}^b1\] \[a_1(ba)+d\sum_{n=a}^bnd(ba)\] stuff like that
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
but yes ..., 15, 19, 23, 27 fill in all 8 terms
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
\[\frac{n}{2}(a_1+a_8)=sum\]
 one year ago

amistre64Best ResponseYou've already chosen the best response.1
youre welcome, good luck :)
 one year ago
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