Paul's pastry store is also having a sale on cookies. The unit price of any cookie at Paul's Pastries is the same unit price of a cookie in the sale pack at Susie's bakery. How much would it cost a customer for 10 cookies at Paul's Pastries?

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