Amina bought a car that costs 20 000 dollars. a discount of 15% is allowed to a customer who can pay cash. how much will she pay cash is a sales tax of 10 is impossible on the sale of the car

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