Please help (circle proofs)

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).

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

Abank gives 6.5% interest per year. what is the growth factor b in this situation?