Find the product of 918.642 and 1/10

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 set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational numbers

It says factor each expression completely 8y+48