Plot and label the point on the coodinate this is for 5th grade 405

Ineed to learn how to solve this problem

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get