pLEASE HELP ME vector paraboloid question

[rawdy]

Can some1 help me answer this question ?

Will really appreciate , been racking my brain for it ...

 

[rawdy]

please help me on this question , been racking my brain for this , appreciate if any1 can help me answer this..

 

[stapel]

View attachment 7757

Can some1 help me answer this question ?

Will really appreciate , been racking my brain for it ...

Please reply showing your efforts so far, so the volunteers can see where you're getting stuck. Thank you!