Solve 4x^2-16x-84 by factoring, completing the square and, by quadratic formula(show work, pls)20 points

(write as unit rate) 12 meters in 2.8 seconds =

Find the total area for the regular pyramid ( follow the answer set up in the picture)

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).