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Archimedes Principle: Expression for Uncertainty

Pfl=((T-T'')/(T-T')) Pw     Assume that all of the tensions (T, T', and T'') were measured and P is a known constant.  Give a valid expression for the uncertainty of Pfl. So far I have
u=T-T'' and z=T-T'
Can someone please help me with this problem?

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