using PEMDAS, we’ll first tackle P, or parenthesis. in this equation, we have in parenthesis (13-5). 13 - 5 is 8. now, our equation is 64 ___ 8 + 8 = 16. from here, we can determine that the answer is B, divided by- this is because 64 DIVIDED by 8 + 8 equals 16. hope this helps