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4. It is 18 cm squared.
5. It quadruples.

#4. B. 33 cm^2

#5:if each dimension of a rectangular prism is doubled, how is the surface area affected.
Solving:
A=x^2, area is directly proportional to the square of the side
thus,
(A2/A1)= (2x/x)^2
A2=4A1
thus the area two is increases by 4 times or 400%

So the answer is (B)