Answer:
Step-by-step explanation:
Let a represent the altitude of the plane in meters.
Let t represent the time in mins.
Rate of Change: -50
Initial value:1500 m
Equation:
a=1500-50t
Alititude after 9 mins:
a=1500-50x9
a=1500-450
a= 1050
After nine minutes the alititude is 1050.