Find each percent increase or decrease. Round to the nearest whole percent. From 40 cans to 70 cans. * which of these is the answer

67%

75%

90%

300%

please please please help me please

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