What is the answer to 14d-2d=-84?

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

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

Find │–14│ a. 14 b. –14 c. start fraction 1 over 14 end fraction