For moving purposes, the Hendersons bought 23 cardboard boxes for $82.50. There were two kinds of boxes; the large ones cost $7.50 per box and the small ones were $3 per box. How many boxes of each kind did they buy?

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