Please help solve letters D, E, F

Buzzing Baseball You were pitching a baseball game on a beautiful 22C day when a baseball equipped with a loud buzzer came ying directly toward you at a speed of 73.8 kmr'h. You saw the ball just in time to duck so it ew straight over your head. Using your cellphone, you then determined that the buzzing sound from the retreating ball had a frequency of 444 Hz. (a) Find the speed of sound in the air. Cair= 344.6 a mis (b) What speed should you use for the moving ball? Vball = 20.5 mr's v (c) At what frequency is the ball actually buzzing? fball = 470 Hz v (d) What frequency did you hear when the ball passed directly overhead? foverhead = X (e) What frequency did you hear as the ball was moving toward you? ftoward = x (f) What is the size of the approximate doppler shift? szDHz X