High School

The Texas Motor Speedway in Fort Worth is 1.5 miles long and often sees qualifying speeds of 192 miles per hour. Suppose a race is 500 laps, and the driver maintains a constant speed throughout the race. If the y-intercept is 750 miles and the x-intercept is 234 minutes, what is the meaning of the slope -3.2?

A. The car drives at 32 miles per hour.
B. The car drives at 3.2 miles per hour.
C. The car drives at 3.2 miles per minute.
D. The car drives at 0.32 miles per second.

Answer :

Final answer:

The meaning of the slope -3.2 is that the car drives at a speed of 3.2 miles per minute.

Explanation:

The meaning of the slope -3.2 in this context is that the car drives at a speed of 3.2 miles per minute. The slope represents the rate of change of the distance covered with respect to time. Since the x-intercept is given in minutes and the y-intercept is given in miles, the slope represents the rate of change in miles per minute.

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