For OA with secants BC and tangent BD, what is an expression for r in terms p and q?​

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).

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Factor the expression using the gcf. the expression 21m−49n factored using the gcf