What is the slope of the line on the graph?

S-7< 3 i need answering this problem someone asap answer

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).

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function