Answer:
440 m
Step-by-step explanation:
We are to assume that Time is measured from the beginning of Amir's drive. So the altitude at the beginning of Amir's drive is the altitude corresponding to Time = 0. That is the point at the left side of the graph where the blue line meets the vertical axis.
The number on the vertical axis at that point is 440, and the label tells us that is meters of altitude. Amir's altitude at the beginning of his drive is 440 meters.
