Sunday

December 21, 2014

December 21, 2014

Posted by **brianna** on Wednesday, November 14, 2012 at 5:24pm.

- math -
**Reiny**, Wednesday, November 14, 2012 at 6:28pmsum(n) = n(first + last)/2

= 22(56-28)/2

=308

**Answer this Question**

**Related Questions**

Precalculus - The 8th term in an arithmetic sequence is 5, and the sum of the ...

Math - Arithmetic Sequences - The sum of the 4th and the 14th term of an ...

Arithmetic Sequence - Given the third term of an arithmetic sequence less than ...

Algebra - True or False 1. 5, 5, 5, 5, 5,
is an arithmetic sequence...

Maths - 1..The first 2 terms of a geometric progression are the same as the ...

Math - Penn writes a 2013-term arithmetic sequence of positive integers, and ...

Math - Penn writes a 2013-term arithmetic sequence of positive integers, and ...

arithmetic - An arithmetic n geometric sequence have the same first term 2.with ...

Math - 3,5,-5... The first term in the sequence of #'s shown above is 3. Each ...

math - find the rule for the Nth term of the arithmetic sequence. 11/2, 25/6, 17...