Hi I need help with questions 8-12 please

6:53 a webassign.net 8. [-/1 Points] DETAILS TANAPMATH7 10.4.042. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Lynbrook West, an apartment complex, has 100 two-bedroom units. The monthly profit (in dollars) realized from renting out x apartments is given by the following function. P(x) = -12x2+ 1920x - 49,000 To maximize the monthly rental profit, how many units should be rented out? units What is the maximum monthly profit realizable? $ Need Help? Read It 9. [-/1 Points] DETAILS TANAPMATH7 10.4.047.MI.NVA MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The altitude (in feet) attained by a model rocket t sec into flight is given by the function h(t). Find the maximum altitude attained by the rocket. (Round your answer to the nearest foot.) h (t ) = - -+3 + 2+2 + 12t+ 21 (t 2 0) ft Need Help? Master It 10. [-/1 Points] DETAILS TANAPMATH7 10.4.052.NVA MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The weekly demand for the Pulsar 40-in. high-definition television is given by the demand equation p = -0.03x + 509 (0 s x S 12,000) where p denotes the wholesale unit price in dollars and x denotes the quantity demanded. The weekly total cost function associated with manufacturing these sets is given by C(x) = 0.000003x5 - 0.03x2 + 400x + 80,000 where C(x) denotes the total cost incurred in producing x sets. Find the level of production that will yield a maximum profit for the manufacturer. Hint: Use the quadratic formula. (Round your answer to the nearest whole number.) units 11. [1/1 Points] DETAILS PREVIOUS ANSWERS TANAPMATH7 10.4.060.NVA MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The amount of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in the city of Long Beach is approximated by 126 A(t) = - 1 + 0.22(t - 6)2 + 28 (0 s t s 11) where A(t) is measured in pollutant standard index (PSI) and t is measured in hours, with t = 0 corresponding to 7 A.M. Determine the time of day when the pollution is at its highest level. time = (1 P.M. 12. [-/1 Points] DETAILS TANAPMATH7 10.4.066.NVA MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The percentage of alcohol in a person's bloodstream t hr after drinking 8 fluid oz of whiskey is given by the function below. A(t) = 0.23te-0.3t (0 S t s 12) At what time after drinking the alcohol is the percentage of alcohol in the person's bloodstream at its highest level? (Round your answer to two decimal places.) t = hr What is the level? (Round your answer to three decimal places.) % Submit Assignment Save Assignment Progress