HELP AGAIN PLS SIR/MA AM/ IT

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).

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second