Mark wants to fence 4 rectangular gardens, each with a length of feet and a width of feet. what is the total length of fencing mark needs to surround all 4 gardens?

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