nitrogen-measurement-abs-vs-conc-and-unknown-samples

I have attempted some of the Qs on the attached sheet but have no idea whether I am answering correctly as no worked examples were given and some of the wording is ambiguous. I need to know if my Ans so far are correct and I am particularly unsure about the Q in the 2nd part of pg 2 re ‘Use the equation given on your graphs (y = mx + c) calculate the concentrations of the unknowns‘ and follow on Qs. -Help please! Thanks

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