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C(x) = -11x4 + 500x + 110 where (0 s x s 15) (a) Find C'(x). C' ( x ) = -22x + 500 (b) What is the rate of change of the total cost (in dollars) when the level of production is 10 surfboards a day? 280 per surfboard Need Help? Watch It 7. [-/1.11 Points] DETAILS TANAPCALCBR10 2.6.036.NVA MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Demand for Tents The demand for Sportsman 5 x 7 tents is given by the following function where p is measured in dollars and x is measured in units of a thousand. (Round your answers to three decimal places.) p = f(x) = -0.1x2 - x+ 40 (a) Find the average rate of change in the unit price of a tent if the quantity demanded is between the following intervals. between 5500 and 5550 tents $ per 1000 tents between 5500 and 5510 tents $ per 1000 tents (b) What is the rate of change of the unit price if the quantity demanded is 5500? per 1000 tents Need Help? Watch It 8. [1.11/1.11 Points] DETAILS PREVIOUS ANSWERS TANAPCALCBR10 2.6.048. MY NOTES ASK YOUR TEACHER The graph of a function is shown