Im back again purr help

How many $20 bills do you need to have to make $280

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,

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