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Val97
 2 years ago
Please Help! Show me how its done please!
Find the sum of the first 8 terms of the sequence.
1, 3, 7, 11, ...
Val97
 2 years ago
Please Help! Show me how its done please! Find the sum of the first 8 terms of the sequence. 1, 3, 7, 11, ...

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amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1sooo, you need help adding? or is it that you really need help in determining all the 8 terms?

amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1since 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.

Notamathgenius
 2 years ago
Best ResponseYou've already chosen the best response.0Fine out what the term is going up by. I see 4

Val97
 2 years ago
Best ResponseYou've already chosen the best response.0I 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?

amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1formulas are only half the battle. seeing a pattern is the key once you see that pattern, the formula is known by default

Val97
 2 years ago
Best ResponseYou've already chosen the best response.0So that is it? Its isn't any of the formulas they gave me?

amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1if you subtract 4 from the last term given, what do you get?

amistre64
 2 years ago
Best 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

amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1but yes ..., 15, 19, 23, 27 fill in all 8 terms

amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1\[\frac{n}{2}(a_1+a_8)=sum\]

amistre64
 2 years ago
Best ResponseYou've already chosen the best response.1youre welcome, good luck :)
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