Answer:
There's a video called Drawing Position vs Time Graphs made by MrDGenova that may help you, it's only three minutes long.
Explanation:
Hope that helps, if not, you could tell me what you don't understand and I could try explaining it in further detail.
Answer:
which pic...? there is no picture attached to your question
The answer is
Pitch of the buzzer increased (higher tone) as it moves towards the observer
The meaning of inference is the process of inferring something and it is a noun
