Hello. I am looking for help with my homework. For numbers 1 and 3, I am looking to see if I did the problem correctly. For number 2, I am completely lost and don't know where to begin.
S(Subscript 1)= 30+20x-0.4x^2+b(subscript 1)y
S(Subscript n)=24.58+325.18(1-e^(-x/14))+b(subscript 1)y
1. What is ∂S(subscript 1)/∂x? Does this indicate that sales might actually decline after some amount is spent on TV advertising? If so, what is this amount?
20-.8x
Yes, 25 million.
2.Does the quadratic model S(subscript 1)(x,y) indicate that sales will become negative after some amount is spent in TV advertising?Does this model cease to be useful in prediciting sales after a certain point?
3. What is ∂Sn/ ∂x? Does this indicate that sales will continue to rise if additional money is devoted to TV advertising?
23.2271e^(-x/14)
No, it does not indicate that sales will continue to rise if add'l money is devoted to TV advertising