Please include step by step explanation bc I've been having trouble with this

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).

According to the data set, where should the upper quartile line of the box plot be placed?

Identify the number 127 as a rational or irrational. explain