Tuesday

November 25, 2014

November 25, 2014

Posted by **lindsay** on Tuesday, July 22, 2014 at 2:53pm.

- math -
**Reiny**, Tuesday, July 22, 2014 at 6:14pmsum(n) = (n/2)(first + last)

sum(11) = (11/2)(1+6)

= 77/2

**Answer this Question**

**Related Questions**

math - Find the sum of the first 33 terms of the arithmetic sequence whose first...

Algebra1 - Find the sum of the first 33 terms of the arithmetic sequence whose ...

arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...

arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...

Math - Find the sum to 5 terms of the geometric progression whose first term is ...

arithmetic - the sum of the n termsof an ap whose first term is 5 and common ...

arithmetic - Find the sum of the first 25 terms of an arithmetic sequence whose ...

math - write the first five terms of a geometric sequence whose first term is ...

math - find the 4th term of an arithmetic sequence whose first term is -8 and ...

Math - 1) If the sum of the first n terms of a series is Sn where Sn=2nē-n, (a)...