A plane is on its approach to land on the runway. The jet's height above the ground is given in feet as a function of the time in seconds. The following table tracks the plane as it lands: t (in seconds) n (in feet) 10 14000 15 3500 10 3000 115 2500 2000 20 25 1500

Calculate the slope. Use the formula m = What is the significance of the sign of the slope?

a. The plane is losing altitude.
b. The plane is gaining altitude.
c. The plane is remaining at a constant height.
d. The plane is losing altitude at a rate of 500 feet/second.