SOLUTION: An airplane descends from 42,000 ft to 18,000 in 12 minutes. Express its rate of change in altitude in feet per minute as a signed number. (This chapter is discussing integers in

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 Question 525978: An airplane descends from 42,000 ft to 18,000 in 12 minutes. Express its rate of change in altitude in feet per minute as a signed number. (This chapter is discussing integers in multiplication and division.)Answer by jim_thompson5910(28476)   (Show Source): You can put this solution on YOUR website!(18000-42000)/12 (-24000)/12 -2000 So the rate of change is -2000 ft/min Basically, the plane is descending 2000 feet every minute.