HELP PLEASE!

10 points

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).

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Which function has the domain x> -11