Question

First ten terms of 12-n

Answer 1

I am not sure....

that is, it increases or decreases by a constant amount each term), and you want to find the sum of the first n terms.

Denote this partial sum by S n . Then

S n = n ( a 1   +   a n ) 2 , 

where n is the number of terms, a 1 is the first term and a n is the last term. 

The sum of the first n terms of an arithmetic sequence is called anarithmetic series .

Example 1:

Find the sum of the first 20 terms of the arithmetic series if a 1 = 5 and a 20 = 62.

S 20 = 20 ( 5   +   62 ) 2 S 20 = 670

Answer 2

Answer:

what is a term

Step-by-step explanation:

if i knew what a term was i could help you