The idea is to convert everything to the same unit - for instance, convert the cm to mm. Then you can easily subtract.
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The density is (its mass)/64 grams/cm3
The formula for the volume of a cube is height x width x length, therefore V = 4cm x 4cm x 4cm V = 64cm3
3.2 what? cm? metres? kilometres?
A square with a side length of 4cm has an area of 16cm2
28mm will be the outside diameter. In the UK, depending on what BS standard the pipe is designed to, the thickness of the copper will be either 0.9mm or 1.2mm, the same as for 22mm pipe. assuming to thicker later type, then the internal diameter would be 28mm - (2*1.2mm) = 25.6mm