It is B. Nikita used the wrong measurements when finding the area of the base. Please give a like. I Promise this is correct and if its not you can yell at me and all that! :)
Answer:
-56;+4
Step-by-step explanation:
56 oopposite is -56
-(-4)=+4
The answer is most likely 20, if together, they have 26. Basically, 26 - 6 = 20.