i just need help to go the (( propagation of error )) for part 1

I already made my lab report class ((  Circuits and Instrumentation Laboratory)) I just need help to go the (( PROPAGATION OF ERROR )) for part 1 section (B) AND Part 2 for section (B). 

 I just need help to go the (( PROPAGATION OF ERROR )) for part 1 section (B) AND Part 2 for section (B). I HIGHLIGHT THEM WITH ( YELLOW COLOR )

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