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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?

Answer :

The correct answer is:

6 times.

Explanation:

When the graph hits the horizontal axis, this means the y-value, in this case the altitude, is 0.  This will happen at take-off and when the plane lands on the return trip.

The plane will also have an altitude of 0 at the two intermediate stops from Chicago to New York.  This makes 2+2 = 4.

The plane will also have an altitude of 0 when it lands in New York as well as the one intermediate stop from New York to Chicago.  This makes 4+2 = 6.

Answer:

6 Times

Step-by-step explanation:

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