Multiple Choice
From a rectangular piece of cardboard having dimensions W = 18 and L = 40 an open box is to be made by cutting out identical squares of area x 2 from each corner and turning up the sides (see Illustration) . Find all positive values of x such that the volume of the box V ( x ) > 0. Include only allowable values of x in your answer.
A)
B)
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E)
Correct Answer:

Verified
Correct Answer:
Verified
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