one size of jewel case is 140mm times 120mm times 4mm. What is the surface area of this jewel case?

Google how a "rectangular prism" looks like. It is a 3D rectangle.

Surface area of front and back is : 140mm*120mm*2=33600mm

Surface area of left and right side is: 120mm*4mm*2=960mm

Surface area of top and bottom is: 140mm*4mm*2=1120mm

Thus the surface area of the jewel case is: 33600mm+960mm+1120mm=35680mm

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