A piano manufacturer has a daily fixed cost of $1,600 and a marginal cost of $2,100 per piano. Find the cost C(x) of manufacturing x pianos in one day. C(x) = Correct: Your answer is correct. Use your function to answer the following questions. (a) On a given day, what is the cost of manufacturing three pianos? $ 7900 Correct: Your answer is correct. (b) What is the cost of manufacturing the third piano that day? $ 2100 Correct: Your answer is correct. (c) What is the cost of manufacturing the 11th piano that day? $ 2100 Correct: Your answer is correct. (d) What is the variable cost? $ Incorrect: Your answer is incorrect. What is the fixed cost? $ 1600 Correct: Your answer is correct. What is the marginal cost? $ 2100 Correct: Your answer is correct. per piano