28. Last week, Lee earned some money babysitting. He spent of his earnings on dinner. He spent another
of his earnings on a movie. He saved the remaining
$19.80. How much did he earn from babysitting last
week?
F. $20.25
G. $29.70
H. $30.69
J. $36.00
K. $44.00

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