Roberto paid $35.75 for dinner at a restaurant, plus an additional $7.15 tip. What percent of the bill did he pay as a tip? Round to the nearest percent, if necessary.

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