Make an input-output table showing the cost for 14 to 20 credit hours if the tuition is $64 per credit hour for 1 to 18 credit hours and $1600 for more than 18 credit hours.

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).