Can you please help me

1. How can you estimate the speed of a car that has passed you just by listening to the pitch of its whine? 2. Label the diagram below and tell if the observer perceives the pitch that is higher, lower, orjust the same as the pitch heard by the driver. 9. Write for each observer - will they see red shift, blue shift or no change based on their position relative to the movement of the star 6533.1\" 1'5