Billy and his three friends decided to divide 750 sports cards among themselves. Billy took 200 cards, Leroy took 20% of the cards, Jimmy took 3/10 of the cards, and Rodger took the cards that were leftover. 200
175
225
150

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