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identify the domain of the function shown in the graph

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).

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')

What is the surface area of a cube with the volume of 729 ft?