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
