What is a cylinder diameter of 3 feet and a height of 4.5 feet . if the barrel is empty , which is the closet to the minimum amount of water needed to completely fill the barrel?

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis