After running 10 miles, David drank 2 bottles of water. His brother was thirstier and drank times as much as David. What equation can be used to find out how many bottles of water David's brother drank?

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