Will give 25 points and brainliest to the correct answer find an equation for the nth term of the arithmetic sequence. 9, 11, 13, 15, answer choices a) an = 9 + 2(n - 1) b) an = 9 + 2(n + 1) c) an = 9 + 2 d) an = 9 + 2(n)

9+2 is a great start but you can not go on after that because there's not a term to change the number after adding 2.
The answer is
A) an = 9+ 2(n-1)
Because when you plug in numbers from 0 to 4, you get the following numbers in their correct sequence.
9+ 2(0-1)= 7
9+ 2(1-1)= 9
9+ 2(2-1)= 11
9+ 2(3-1)= 13
9+ 2(4-1)= 15