What is the value of the expression 8–2? –2 is an exponent .

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).

Me because some of question i don’t understand

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9