QuestionThe total cost (in dollars) of producing $x$ coffee machines is $$C(x)=1700+50 x-0.7 x^{2}$$ (A) Find the exact cost of producing the 21st machine.
Exact cost of 21st machine $=$ $\square$ (B) Use marginal cost to approximate the cost of producing the 21st machine.
Approx. cost of 21 st machine $=$ $\square$