Sorry about the stupid posts, anyway, i do have a real question i need help with: An open-topped box can be created by cutting congruent squares from each of the four corners of a piece of cardboard that has deminesions of 20cm by 30cm and folding up the sides. Determine the dimennsions of the squares that must be cut to create a box with a volume of 1008cm^3.
length=30-2x
width=20-2x
h=x
and I don't get this because x and cm arent interchangeable digits.

Question

Sorry about the stupid posts, anyway, i do have a real question i need help with: An open-topped box can be created by cutting congruent squares from each of the four corners of a piece of cardboard that has deminesions of 20cm by 30cm and folding up the sides. Determine the dimennsions of the squares that must be cut to create a box with a volume of 1008cm^3. 
length=30-2x
width=20-2x
h=x
 and I don't get this because x and cm arent interchangeable digits.