Posted by **Poppy** on Sunday, December 18, 2011 at 7:34pm.

the ninth term of an arithmetic sequence is 23 and the 33rd term of the sequence is -241 , calculate the sume of the first 15 terms of the sequence , using the formula

s=n(2a+(n-1)d)/2

## Answer This Question

## Related Questions

- Algebra - True or False 1. – 5, – 5, – 5, – 5, – 5, … is an arithmetic sequence...
- Math - A sequence is formed by adding together the corresponding terms of a ...
- Maths - 1..The first 2 terms of a geometric progression are the same as the ...
- math - in an arithmetic sequence the common difference is equal to 2.the first ...
- math - The 1st,5th,13th term of an arithmetic sequence are the first 3 terms of ...
- algebra - the third term of an arithmetic sequence is 14 and the ninth term is...
- Can someone help me?! - The 1st, 5th and 13th terms of an arithmetic sequence ...
- math - Determine whether each sequence is arithmetic or geometric. Find the next...
- mathematics - 1.1 the third term of an arithmetic sequence is 8 and the 15 term ...
- math30 - Sequences 1)A sequence has a first term of 24 and every other term is ...

More Related Questions