(20 Point) help plz me

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).

Why do interests rates on loans to be lower in a weak economy than in a strong one

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16