# Arithmetic Series/Sequence merger

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• September 29th 2009, 11:34 AM
Charchar
Arithmetic Series/Sequence merger
Im not quite sure how to do this.. I am instructed to find the value of the 11th term of an arithmetic sequence where t1=-13 and the sum of the first 1 terms is -33. Now I thought I could use the equation -33= (-13+tn/2)11
but that is either not the right approach or I am simplifying it wrong(both likely). Any help is very appreaciated
• September 30th 2009, 01:01 AM
red_dog
$S_{11}=\frac{(t_1+t_{11})11}{2}$

Then $-33=\frac{(-13+t_{11})11}{2}$

Now find $t_{11}$