Can someone solve this calculus problem?

an advance!

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).

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

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