Jenny has a bottle of juice. Each day, Jenny uses 30 ml of juice. After 3 days, Jenny has 4/5 of the juice left. How much juice was in the bottle to begin with?

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