the expenditure for one day excursion for 17 students is rupees 7225 find how much amount each student has to pay?​

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).

Ineed to know the answer to this algebra question.

Construct the graph that models the given situation