There must be a typo in this question.  It is no use to have been given f'(4).  I suspect they meant f'(2) or they meant to give you x=16. Contact the prof about this.

There must be a typo in this question.  The sine function is missing an argument.  I assume they meant to write sinx.  Contact the prof about this.

There must be a typo in this question.  The graph shows a different function than that given in the problem.  I assume they meant the graph to also be labelled lnx?3.  Contact the prof about this.