Question

The table shows the linear relationship between the elevation in feet of an airplane as it ascends and the number of minutes.
What is the rate of change of the elevation of the airplane with respect to the number of minutes since the plane started its ascent?
Remember that rate of change is slope.
Number of Minutes: 2, 4, 7, 12
Elevation (ft): 1,200, 3,600, 7,200, 13,200
A. 900 ft/min
B. 1,200 ft/min
C. 1,500 ft/min
D. 1,800 ft/min

Answer 1

Slope = change in elevation / change in time. For example, from 2 to 4 minutes elevation rises from 1,200 to 3,600: (3,600 − 1,200)/(4 − 2) = 2,400/2 = 1,200 ft/min.
Answer: B.