A club sold standard and premium memberships.
The graph shows the number of each type of membership sold over the last four weeks.
Which statement is supported by the information in the graph?

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