What is the next number in the pattern below?
3,5,9, 15, 23,
a. 31
b. 33
c. 35
d. 37

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