SOLUTION: What is the sum of this arithmetic series?
https://postimg.org/image/p3law3x9z/
A.) 25
B.) 126
C.) 133
D.) 119
Please & TY!
Algebra.Com
Question 1041160: What is the sum of this arithmetic series?
https://postimg.org/image/p3law3x9z/
A.) 25
B.) 126
C.) 133
D.) 119
Please & TY!
Found 2 solutions by jim_thompson5910, ikleyn:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
We will use the following rules for summations
Rule 1: = \sum_{n=1}^{k}(a)+\sum_{n=1}^{k}(b) )
Rule 2:  = c*\sum_{n=1}^{k}(a) )
Rule 3:  = \frac{k*(1+k)}{2})
Rule 4:  = k*c)
where c is a constant
-----------------------------------------
)
+\sum_{n=1}^{7}(11))
Use rule 1 (shown above)
+\sum_{n=1}^{7}(11))
Use rule 2 (shown above)
}{2}+\sum_{n=1}^{7}(11))
Use rule 3 (shown above)
}{2}+7*11)
Use rule 4 (shown above)
-----------------------------------------
So  = 133)
The final answer is 133
Answer by ikleyn(52797) (Show Source): You can put this solution on YOUR website!
.
On arithmetic progressions see the lesson Arithmetic progressions in this site.
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