13. The line segment on the graph shows the altitude of a landing airplane from the time its wheels are lowered to
the time it touches the ground. Which of the following best describes the slope of the line segment?

F. The seconds per feet it takes to land the plane
G. The landing of the plane took 180 seconds
2000
H. 180 seconds / 1500 feet
15001
I. the feet per second it takes to land the plane
Altitude
(feet)
1000
500
0
30 60 95 120 150 780
Time
(seconds)