NDT 9. [0.3311 Points] DETAILS I PREVIOUS ANSWERS LARAPCALC1DE.3.D52. Biology Because of an insufcient oxygen supply, the trout population in a lake is dying. The population's rate of change can be modeled by f = enoe't'ED o't where t is the time in days. When t : 0f the population is 3,300. (a) Find a model for the population. r P") = 3300.; 30 \f (b) What is the population of sh after 12 days? (Round your answer to the nearest integer.) (c) How long (in days) will it take for the entire trout population to die? (Assume the entire population has died off when the population is less than one. Round your answer to one decimal place.) Need Help? Submit Answer 10. [-I1 Points] LARAPCALCW 5.3.056. The rate oi= change in revenue for DIRECTV from 2004 through 2013 can be modeled by where R is the revenue [in billions of dollars} and t is the time (in years), with t = 4 corresponding to 2004. In 2010, the revenue for DIRECTV was 524.1 billion.l' (a) Find a model for the revenue of DIRECTV. (Round your constant term to two decimal places. Remember to use absolute values where appropriate.) 9(3) : (b) Find the revenue of DIRECTV in 2013. [Round your answer to two decimal places.) 8. [0/1 Points] DETAILS PREVIOUS ANSWERS LARAPCALC10 5.4.048.MI. Find the change in cost C for the given marginal. Assume that the number of units x increases by 3 from the specified value of x. (Round your answer to two decimal places.) Marginal Number of Units, x 28,000 dx x = 18 $ -222.2 X Need Help? Read It Watch It Master It 2. [-/1 Points] DETAILS LARAPCALC10 5.5.010. The integrand of the definite integral is a difference of two functions. Sketch the graph of each function and shade the region whose area is represented by the integral. (. [ ( x - 5 ) - ( x2 + 4x - 5) ]dx Graph Layers Clear All -10 -9 -3 -7 -6 -5 4 -3 -2 -1 23456 7 8 9 10 Vertical Parabola 1 X Delete O Fill No Solution Help WebAssign. Graphing Tool + Submission Data