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The formula to calculate the volume of a rectangular prism (which can be used to represent a piece of cake) is V = Base Area x Height.
In this case, the base area of the cake is 40cm2 and the height is 7cm.
Therefore, the volume V = 40cm2 x 7cm = 280cm3.
So, the volume of the piece of cake is 280cm3.
Therefore, the correct response is:
A 280cm3