Find the value for
20:5=30:X

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 is the difference between regular convex and concave polygons

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points