The answer will depend on what information is available. Ideally, you know the length, breadth and height (in the same units of measurement) and simply multiply the three together.
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I'll make the assumption that 150 is meant to be metres. 150x6 is 900, x 2.5 is 2250
4.074 cubic yards for every foot the slab is thick.
9 metre2
You cannot. In general there is no relationship between the area of a slab and its thickness.
You need to specify the slab's width and the length as well.