Calculus and Vector

Please can answer the questions on the attachment 

  • There is a minus typo in the problem. Either the field is =xy^2 i - x^2 yj + 2(x^2+y^2)k or the field is =-xy^2 i + x^2 yj + 2(x^2+y^2)k

  • There was no typo, sorry. The correct field has a z at the end but it looked like a 2 to me: -xy^2 i - x^2 yj + z(x^2+y^2)k The field must be =-xy^2 i-x^2 yj+2z(x^2+y^2)k

  • * The field must be =-xy^2 i - x^2 yj + z(x^2+y^2)k

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