I need help with this- will mark brainliest for an explanation :)

Answer:
11
Step-by-step explanation:
It's being added by two so do that 5 more times and you'll get 11.
-5, -3, -1, 1, 3, 5, 7, 9, 11
Check; Subtract -3 and -5; -3 --5 (turn the two "--" into a "+"
-3 + 5 = 2, so you're adding two every time.