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**Latszer** The shed is filled with sawdust whose density (mass/unit volume) at any point is proportional to the distance of that point from the floor. The constant of proportionality is *k*. Calculate the total mass of sawdust in the shed. Your answer will have *l*, *r*, and *k* in it.

I really am having trouble finding the volume of a slice for this one, more specifically how I can relate l and r to the width, and then how would I set up the integral for this one? Any help appreciated.

-Tyler