The absolute value of a number is its distance from 0. An easy way to think about this is that the absolute value turns a negative number positive, and has no effect on positive numbers. In this case, we are taking the absolute value of a negative number. This means we should simply make the number positive. Therefore, the answer is 
how to work out the surface areas of cuboid? height=2cm length=10cm width=7cm Please do it step by step
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