Explain your answer !!

Will give brainlst

Write an explicit formula that represents the sequence defined by the following recursive formula:

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).

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take