Question

A plane that carries mail makes a round trip each day from Chicago to New York. It makes 2 intermediate stops on the way to New York and 1 intermediate stop on the way back to Chicago. Suppose you make a graph of the altitude of the plane for one day, with time on the horizontal axis and altitude on the vertical axis. How many times will the graph touch the horizontal axis?
A. 3
B. 6
C. 5
D. 9

Answer 1

C 3 plus two is five

Answer 2

Answer:

Option: C

Step-by-step explanation:

As going from Chicago to New York the plane makes two intermediate stops.

This means that the graph will touch the Horizontal axis

• at initial point when the flight is at Chicago

• Next at the first intermediate stop

• then at the next intermediate stop

• finally after reaching New York

After going back from New York to Chicago

This means that the graph will touch the horizontal axis

• first initially at New York
• Then at the intermediate stop
• Finally on reaching Chicago

but the Point on the Horizontal axis at New York and Chicago is counted twice

Hence, the total times the graph will touch the horizontal axis is 5.

Hence, option: C is correct.