Question

What are the explicit equation and domain for an arithmetic sequence with a first term of 5 and a second term of 3?

Answer 1

@ganeshie8 @Kainui

Answer 2

@myininaya @agent0smith @Loser66

Answer 3

Notice the common difference is -2.
The first term is 5.
Let f(x) be the function that describes the sequence.
f(x) = -2(x-1) + 5
...
For the domain, notice how the arithmetic sequence decreases monotonically from the first term of 5.