An open box is made from a 30-cm by 70-cm piece of tin by cutting a square from each corner and folding up the edges. The area
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This is the answer
if substitute 1 and 2 and 3 as x then the points will be :
and that's the picture
good luck
if substitute 1 and 2 and 3 as x then the points will be :
and that's the picture
good luck