Help me with this please

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).

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation