A ball is kicked upward. The height, h (in feet), of the ball is modeled by h = -16t+ 40t, where t is measured in seconds.
How long does it take the ball to reach its highest point?
O A. 25 seconds
OB. 1.25 seconds
O c. 2.5 seconds
OD. 1.4 seconds

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).

Triangle xyz has vertices x(1,3), y(0,0)

If you answer 2+2 you will get over 80 points