Please help with the wrong answer

10. [0.56/1 Points] PREVIOUS ANSWERS TANAPCALC9 3.2.056. Demand Function for Sports Watches The demand function for the Sicard sports watch is given by d(x) = 40 0.01x2 + 1 (05x520) | PRACTICE ANOTHER where x (measured in units of a thousand) is the quantity demanded per week and d(x) is the unit price in dollars. (a) Hndde) d'(X) = 0.8x (1 +0.01%)2 J (b) Find the following values in dollars per thousand watches. (Round your answers to two decimal places.) d'(5) d'(10) d'(19) $ -2.56 $ -2.00 $ -o.72 per thousand watches per thousand watches per thousand watches Interpret the results. (Round your answers to two decimal places.) When the demand for watches is 5,000, the unit price for the watches is decreasing by per thousand watches. when the demand for watches is 10,000, the unit price for the watches is decreasing by $ x per thousand watches. when the demand f Enter a number. ,000, the unit price for the watches is decreasing by Additional Materials III eBook $ 8.67 x per thousand watches