Bianca puts $10 in a savings account each month and an extra $20 when she receives money for her birthday. Which expression represents the amount she has saved in one year

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