6th grade math help me 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).

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?