Please help with this question from HP SA1 /2017.…

Please help with this question from HP SA1 /2017. Thanks 

Hi,My girl is stuck with the question for part…

Hi, My girl is stuck with the question for part b. What is the concept to be used to solve…

Hi, please let me know why answer for (b)…

Hi, please let me know why answer for (b) is wrong.  Thank you.

How to answer question b as the answer provide…

How to answer question b as the answer provide is ambiguous.

Hi , pls help on this question. thanks very much !Fly2High 

Hi ,   pls help on this question.   thanks very much ! Fly2High