Answer: B.

Step-by-step explanation:
i just took the assignment
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! :)
4000 is the answer to your question
2(x4) = 35 - (7-4x)
+4x
2(x8)= 28
/2 /2
8x = 14