# What is the sum of a 22-term arithmetic sequence where the first term is 56 and the last term is -28?

##### 1 Answer

Apr 10, 2016

308

#### Explanation:

The sequence is {56+(n-1)d}, 2 = 1, 2, 3, ...,22, wher d is the common difference.

The last term (n=22) is

So,

The sum =

The sum simplifies to 308.