need help please whats the answer

Need Help Please Whats The Answer class=

Answer :

Answer:

9

Step-by-step explanation:

Sorry if it is incorrect but here is why I think it is 9 so 13 + 13 is 26 if the perimeter is 44 subtract 44 by 26 you get 18 divide that by 2 and you get 9 have a nice day sorry again if its wrong I suck at math