Help please im bad at math

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 t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

Apackage of orgainc strwberries costs $1.50 while there in season and $2.25 when not in season what the percent increase