#9answer both parts please

odule 2 (7%) Problem 9: One day when the speed of sound in air is 343 m/s, a fire truck traveling at vs = 31 m/s has a siren which produces a frequency of f = 422 Hz. Randomized Variables VS = 31 m/s f = 422 Hz Forbes, David - david.forbes@doane.edu @theexpertta.com - tracking id: 9N69-72-B9-45-AB7A-40025. In accordance with Expert TA's Terms of Service, copying this information to any solutions sharing website is strictly forbidden. Doin so may result in termination of your Expert TA Account. D 4 50% Part (a) What frequency, in units of hertz, does the driver of the truck hear? fa = 1 Hz Grade Summary Deductions Potential 100 sin() cos() tan() 7 8 9 LOME Submissions cotan() asin acos() E 4 5 6 Attempts remaining (83% per attempt) atan acotan() sinh( 2 3 detailed view cosh() tanh() cotanh() + O END O Degrees O Radians VO BACKSPACE CLEAR Submit Hint Feedback I give up Hints: 0% deduction per hint. Hints remaining: 1 Feedback: 0% deduction per feedback. 4 50% Part (b) What frequency, in units of hertz, does an observer hear when the truck is moving away