12. [-/3 Points] DETAILS LARCALC11 5.7.087.MI. An airplane flies at an altitude of 5 miles toward a point directly over an observer. Consider e and x as shown in the figure below. 5 mi Not drawn to scale (a) Write e as a function of x. e (x) = (b) The speed of the plane is 392 miles per hour. Find de/dt when x = 6 and x = 5. (Round your answers to three decimal places.) when x = 6 de dt rad/h when x = 5 de dt rad/h Need Help? Read it Master it 13. [-/1 Points] DETAILS LARCALC11 5.8.005. Find the indefinite integral. (Use C for the constant of integration.) XV 25x2 - 1 dx Need Help? Read It 14. [-/1 Points] DETAILS LARCALC11 5.8.009. Find the indefinite integral. (Use C for the constant of integration.) 2t