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Square corners cut from a 30 cm by 20 cm piece of cardboard create a box when the 4 remaining tabs are folded

upwards. The voulume of the box is V(x)= x(30-2x)(20-2x), where x repersents the height. 

a) Calculate the volume of a box with a height of 2 cm. 
b) Calculate the dimensions of a box with a volume of 1000 cm^3. 
c) Solve V(x) > 0, and discuss the meaning of your solution in the context of the question. 

d) state the restrictions in the context of the question. 

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