Find an equation for the nth term of the arithmetic sequence.

-3, - 5, - 7, - 9, ...

a (n) = - 3 - 2 (n-1)

Step-by-step explanation:

The most general formula for the nth term of an arithmetic sequence (such as this sequence is) is

a (n) = a (1) + c (n-1), where c is the common difference.

Here a (1) = - 3 and c = - 2.

Thus,

a (n) = - 3 - 2 (n-1).